Require server name indication iis. cscfg ’ In Internet Information Services (IIS) Manager, in the Connections menu tree (left pane), locate and click the server name. Server Name Indication, often abbreviated SNI, is an extension to TLS that allows multiple hostnames to be served over HTTPS from the same IP address. This would generate a high load on that OCSP server. Should I set hostname field? Should I tick Require Server Name Indication How should bindings on default website be config’d Your help gratefully received! Russ Jan 29, 2024 · This can be an A or CNAME record pointing to the IP address or hostname of the IIS web server. Feb 15, 2019 · 1. Click OK to save the settings and then close the Site Bindings window. On the server name Home page (center pane), in the IIS section, double-click Server Certificates. Then right click on "Start Page" and select "Connect to a Server". SNI (Server Name Indication) wordt ondersteund vanaf IIS 8. Jan 20, 2023 · Server Name Indication allows multiple Internet Information Server (IIS) websites with unique host headers and unique server certificates to share the same SSL port. Specify the host name. In the IIS Manager, right-click your site and select Edit Bindings. Now I cannot undo it simply by turning it on. You can use the DNS console (dnsmgmt. Because the server can see the intended hostname during the handshake, it can connect the client to the requested website. Some older browsers/systems cannot support the technique. 6. Feb 2, 2012 · Server Name Indication. Some of the sites need to be accessible to older browsers and operating systems, therefore I cannot use the "Require Server Name Indication" option. NET Core application running HTTP. In the Home page, under the Management area, double-click Centralized Certificates. An issue we ran into: The SNI tag is set by the . . It allows a client or browser to indicate which hostname it is trying to connect to at the start of the TLS handshake. Set the value of Type to https. May 15, 2019 · Description Some pool members require Server Name Indication (SNI). From the SSL certificate list, select the certificate for your website. What this effectively means is that the virtual domain name, or a hostname, can now be used to identify the network end point. (If you have multiple IP’s on the server you will want to specify the one you want to use for SNI) * Enter your site/domain name for Host name * Check the box for “Require Server Name Indication” * Select the SSL certificate for the site from the drop down box * Click OK; Add Site Binding Jan 17, 2018 · IIS, When setting up the HTTPS binding on your IIS settings, check the "Require Server Name Indication" and continue to browse for the certificate and select and save the settings. ** ** In this case I am expecting IIS to use the Host Name specified in the Bindings to direct the Jun 14, 2022 · Press the Start button, and then click Server Manager. I'm hosting them on the same IIS server, using one IP address for each family. Use host name to host multiple web applications on the same IP address. Then on the other website www. If you want multiple secure websites to be served using the same IP address, select the Require Server Name Indication check box. ที่ Specify Certificate Authority Response ให้ใส่ข้อมูล ดังนี้ Apr 6, 2018 · Not sure if its the only way but in IIS under the "Connections" pane > right click on the Server Name (available below "Start Page" node) > select "Remove Connection" (Refer screenshot): Then click on Yes to the prompt. Since SNI is not supported by all devices, IIS is showing the following alert: "No default SSL site has been created. And need to delete it by manually in command line : Oct 15, 2013 · To add a new SSL binding with Server Name Indication on an existing SSL site in IIS8:. However, the arrival of Server Name Indication (SNI) changed the entire SSL landscape. Nov 22, 2020 · Hi Francesco, Thanks for the suggestion, and it helped me figure out what the issue was. Every one of the bindings (for each SAN in the UCC) has 'Require Server Name indication' disabled. Expand the SSL Properties section. com do the same, but remove the tick in "Require Server Name Indication". google. net says about it: On Windows Server 2012, IIS supports Server Name Indication (SNI), which is a TLS extension to include a virtual domain as a part of SSL negotiation. This is new for Windows Server 2012 in that host name can be specified for SSL. com has binding set up in IIS and is linked to SSL and has "Require Server Name Indication" checked. It adds the hostname of the server (website) in the TLS handshake as an extension in the CLIENT HELLO message. We need the Powershell to run the script. As a result, the server cannot use HTTP header information to choose which certificate to use for any given request. So no need to create a new ssl profile for each server name, just leave the server name field blank and BIG-IP will read the server names defined in cert :) yay. ; Right-click your website and In the world of TLS, Server Name Indication or SNI is a feature that allows clients (aka your web browser) to communicate the hostname of the site to the shared server. SNI is a transport layer security extension which enables you to use a virtual domain name or a hostname to identify the network endpoint. Jan 13, 2017 · When editing a https site binding, there's an option to add a host name, which makes the web server successfully able to differentiate between websites using the same IP address. SNI support was added to Microsoft IIS starting from IIS 8. 0, 7. msc) to create a CNAME record. mydomain,org. Add my two certificates into the configuration file, named with ‘ ServiceConfiguration. From the SSL certificate list, select your certificate To find the Name of Website in IIS and the Host Header: Open Internet Information Services (IIS) Manager. Access Server in IIS. config, the binding simply doesn't function. Jun 14, 2018 · Server Name Indication (SNI) in IIS Server Name Indication is a TLS extension to IIS 8+ that allows for additional functionality to include a virtual domain as a part of the SSL negotiation. Klik in IIS Manager in het Actions paneel op Complete Certificate Request. Nov 10, 2022 · Using fictional domains here instead of the actual ones I have this situation: domain1. 5 site. And SERVER_NAME is server's host name, DNS alias, or IP address as it would appear in self-referencing URLs. Click on Bindings in the left-side menu. 5 which has a powerful feature for hosting SSL certificates called Server Name Indication (SNI). If the existing web application is using SSL, enable "Server Name Indication" in IIS. So what I'd like to do is add a binding with the IP address as the host name. Apr 17, 2024 · If you plan to add multiple SSL Certificates to the same server, check the Require Server Name Indication box. [1] Nov 17, 2017 · Server Name Indication is an extension to the SSL/TLS protocol that allows multiple SSL certificates to be hosted on a single IP address. Server Name Indication (SNI) is an extension to the TLS protocol. In the Add Site Binding dialog box, perform the following steps: a. To better understand the whole process, we need to take a step back in time before SNI creation. csdef ’. Oct 15, 2015 #1 Jun 30, 2023 · WITH Host Name in Bindings: IIS Bindings : Type http Port 83 IP Address 192. Web. – Oct 5, 2019 · The challenge with this approach occurs when you try to run multiple sites that require an free SSL certificate. and if you have more than one website, you should check that "require server name" in "bindings" (under Https - Edit) also is set for all the OTHER websites you have, or IIS could apply the certificate binded to a website to a different website. It’s in essence similar to the “Host” header in a plain HTTP request. I have setup few websites on IIS8 all using the same wildcard SSL certificate. SNI allows multiple SSL certificates using different domain names to leverage a single dedicated IP address. Apr 10, 2018 · In IIS Manager, expand server name, expand Web sites, and then click the website that you want to modify. Mar 15, 2021 · Each HTTPS binding requires a unique IP/port combination because the Host Header cannot be used to differentiate sites using SSL. \r\nServer Name Indication (SNI) is enabled on the site binding properties by clicking the Require Server Name Indication checkbox. Server Name Indication feature extends the SSL and TLS protocols to allow proper identification of the server when numerous virtual images are running on a single server. ที่แถบ Action ทางขวา คลิกที่ Complete Certificate Request. 2. Click on Jan 17, 2022 · Restart IIS, and Note: You may have to reimport as "Complete certificate renewal" depending on your certificate. Refer to th is document about how to m odify the service definition and configuration files . On the Start screen, type and click Internet Information Services (IIS) Manager. Update: Server Name Indication (SNI) changed support for this, allowing supported browsers/servers to access/host multiple TLS protected sites on one IP using host headers to separate them. com 跟 b. Feb 20, 2019 · 2. Physical path: c:\inetpub\wwwroot. This means that when a visitor requests content over the secure port that instead of being bound to the IP address to then utilize the hostname, the hostname itself is the identifier. May 8, 2020 · In the Host name box, type the name of the host computer. In addition, I removed my second SSL from IIS and re-completed it, re-bound, and restarted the IIS site. adminsitration. Learn how SNI prevents common name mismatch errors and how it works with encrypted SNI (ESNI). web. Feb 29, 2012 · On Windows Server 2012, IIS supports Server Name Indication (SNI), which is a TLS extension to include a virtual domain as a part of SSL negotiation. – 1. Go to SSL Settings and check on Require SSL and hit Apply and go back. Aug 15, 2023 · On Windows Server 2012, IIS supports Server Name Indication (SNI), which is a TLS extension to include a virtual domain as a part of SSL negotiation. 5. You need check it by : netsh http show sslcert in command line, if you find out there is a IP address binding but not in you're IIS, that's it. Oct 11, 2020 · Add the two domain name in the definition file, named with ‘ ServiceDefinition. Administration (inside a Wix CustomAction) to configure Server Name Indication and bind to an existing server certificate on a IIS 8. I'm using IIS 10. Open Server Certificates Manager. This should enable server admins to make an informed decision on enabling SNI-Centric features on IIS 8. Configuration for SNI in IIS is easily done with Require Server Name Indication option. The actual value of this configuration varies depending on the sample certificate that is being used. To properly secure the communication between a client computer and a server, the client computer requests a digital . How to run the script: 1. All sites and the application need to listen on 443 port and use a separate SSL certificate. 0 for Windows 8. Expand your webserver and the Sites folder in the left pane of IIS Manager. DLopez New Pleskian. IIS can be configured to look at the host header for an incoming request route it to the correct web site even on a single IP address. In the Connections pane, select the server name. Server Name Indication (SNI) allows the server to safely host multiple TLS Certificates for multiple sites, all under a single IP address. I only just found out :) Feb 14, 2023 · TLS support for Server Name Indicator (SNI) Extensions. Open navigation menu Home Page MyF5 Jun 24, 2024 · You didn't fix the issue by "disabling SNI", because Windows HTTP API doesn't provide you a way to disable SNI support. Install SSL Certificates for SNI on Microsoft IIS 8 / 8. By default, OCSP support is enabled for IIS websites that have a simple secure (SSL/TLS) binding. Windows Server 2012 beschikt over IIS 8. Double-click on the Aug 6, 2019 · Aside from installing the sub component for IIS Web Server, you need to have: File share – You need to have a centralized share that will be accessible from each server that will be making use of the shared SSL certificate; Certificates – You need a certificate in the PFX format that contains both the public and private keys . The Server Certificates control panel will open in the center window. May 27, 2021 · On a dev server with one IP I have several domains and sites and they have been working fine coexisting with different SSL certs. May 15, 2023 · One such technology is Server Name Indication (SNI), which has become a critical component in the world of web hosting and network management. The following code will make things clearer: Desktop and Mobile Browsers with Server Name Indication (SNI) Support Server Name Indication (SNI) IIS 8 supports Server Name Indication (SNI). Also turn off Directory Browsing while you’re there. SNI is an extension for the TLS protocol that enables a client device to specify the domain name it is trying to reach in the first step of the TLS handshake. This is useful when you have limited IP addresses or want to host multiple secure sites on the same server. Maak voor elke website die u wilt beveiligen een CSR aan met behulp van deze handleiding. Server Name Indication. Feb 12, 2020 · Require Server Name Indication (SNI) if necessary. SNI is a TLS extension that identifies the network end point with a virtual domain name instead of IP:Port binding. d. All you did is merely create IP based mappings by dismissing "Require Server Name Indication" in IIS Manager dialog. Jun 30, 2014 · One of the many great new features with IIS 8 on Windows Server 2012 is Server Name Indication (SNI). Require Server Name Indication: Unselected Oct 29, 2013 · In your case, if you edit the https 443 binding for vpn. There's also an option to "Require Server Name Indication". In Internet Information Services (IIS) Manager, under Connections, click Sites. Launch IIS Manager and click the server name in the Connections menu on the left. Nov 3, 2023 · Things changed when Server Name Indication came, and it provided the owners with the chance to own multiple domains on the server using one SSL certificate. 0, en is dus niet beschikbaar in IIS 6. com and tick the box Require Server Name Indication and enter the hostname of course and click Ok. This is because of the nature of TLS handshakes, which occur before the server sees any HTTP headers when using HTTPS. Jun 2, 2019 · IIS Server Name Indication (SNI) The server hosting my site uses Windows Server 2012 R2 with IIS 8. NET Framework (or Schannel by Windows, not sure) based on the URL passed in the constructor of HttpRequestMessage. Click Restart under the Manage Website Jan 30, 2020 · In the Add Site Binding dialog box, perform the following steps: a. If you wish to install a single certificate on IIS 8, please refer to the IIS 8 SSL Installation Instructions. After a certificate is installed, you need to explicitly tell the server that the certificate you would like to have OCSP stapling configured for, does not require Server Name Indication (SNI): Open IIS Manager and select the website you would like to configure OCSP Stapling for. SSL certificate: In the drop-down list, select the friendly name of the certificate that you just imported with the Feb 22, 2023 · If you yourself are the operator of a web server, the situation is different because you may have to take action - depending on which web server you use: since IIS 8, Microsoft has integrated an option for server name indication into its software by default. In this blog post, we'll delve deep into the concept of SNI, exploring its definition and how it works, why we need it, how to implement it with nginx and on Kubernetes, its advantages and disadvantages Sep 15, 2020 · Define a host name and set 'Require Server name Indication' in the bindings settings for the Versago site. Thread starter DLopez; Start date Oct 15, 2015; D. In IIS Manager, it is equivalent to clicking on a website, then Bindings link on the right, then Add/Edit, and the checkbox "Require Server Name Indication". Both IIS servers have identical configuration and websites (due to sync). Ensure that the SSL Acceleration check box Enabled is selected. 0, if you leave the Server Name box blank, the BIG-IP system reads the Common Name (CN) from the certificate. Click the Modify button on the relevant Virtual Service. com 對應到不同的處理邏輯。 HTTP headers 裡面有個欄位叫做 Host ，會帶有 client 想要訪問的網站域名。 Oct 10, 2017 · Today we’re launching support for multiple TLS/SSL certificates on Application Load Balancers (ALB) using Server Name Indication (SNI). 225 Host Name mysite. In order to use SNI, all you need to do is bind multiple certificates to the same secure […] Nov 21, 2013 · If you use Wireshark to see the actual packages which are sent, you will see a Client Hello with the Server Name Indication set to www. Specify the name of your host running IIS as the FQDN target host. Type: https. I'd also like to be able to set the Require Server Name Indication flag. Nov 22, 2013 · But if you are using SharePoint 2013 on Windows Server 2012, then there is a new thing called SNI (New to IIS anyway) that allows you to use the hostname at the beginning of the handshake to identify the certificate to use. A website owner can require SNI support, either by allowing their host to do this for them, or by directly consolidating multiple hostnames onto a smaller number of IP When a request comes in, IIS matches the port, determines the host name from the request, and searches the centralized certificate store for a certificate file with a matching name. Share Improve this answer Nov 4, 2022 · My problem: on a single server I have: HTTPS web sites running in IIS; an ASP. SNI instellen. Oct 3, 2023 · I am using 2 synchronized IIS servers (as backend for failover) and an nginx reverse proxy (as frontend). This article shows you how to install multiple SSL certificates for Server Name Indication, using the Management Console on Windows 2012 Server. Check the box for Require Server Name Indication. I found the following link which Apr 12, 2024 · To enable Server Name Indication (SNI): In the main menu, select Virtual Services > View/Modify Services. Hostname: centralcert0. To learn more about IP based mappings, you can read this article. example. Apr 16, 2015 · I have two different 'families' of related sites, each with their own UCC certificate on the same server. Jun 4, 2021 · And obviously, IIS won't let you check "REQUIRE SERVER NAME INDICATION" on a blank binding, and if you try to manually set that flag on the binding in applicationhost. On the Home page for the server, locate the IIS section in the center window and double-click Server Certificates. Feb 28, 2024 · Host headers and Server Name Indication (SNI) There are three common mechanisms for enabling multi-site hosting on the same infrastructure. Cloud. com. Turns out, setting SNI takes off the certificate binding. Apr 19, 2024 · Initially, you needed a dedicated IP address for every domain you wanted to secure. Make sure that the Server Administrator has access to store and read the certificates from the Certificate Store location mentioned in the script. This works fine. Of course, extending the definition of a protocol is never as easy as Mar 8, 2017 · and enabled Require Server Name Indication in IIS for this new sites, but my problem is IIS keep sending old certificate for my new sites, Host name: If you are using Server Name Indication (SNI), enter the host name that you are securing. In the Actions pane, click Edit Feature Settings. Before IIS 8 this could May 24, 2023 · However when I go to the URL in the browser, it says the certificate is not trusted (Except for the 1 site whose this certificate belongs to him), and when I click to see the certificate information, I see they all use the same certificate even though each is bound to his own certificate in IIS. 0 of 7. To enable this all you have to do is go into IIS -> edit bindings, and check "Require Server Name Indication". SslFlag on New-IISSiteBinding can be set to None, Sni, CentralCertStore. Pool member sends a TCP reset immediately after receiving Client Hello from BIG-IP LTM. Dec 30, 2022 · Server Name Indication. Nov 13, 2017 · Also Make sure you put a tick mark to REQUIRE SERVER NAME INDICATION and then select the correct certificate from the dropdown in the SSL Certificate section. Toggle showing sub menu for Resources. In this article, we explain what is SNI, how it works, and why you may need it. I configured the incoming rules to rewrite the reverse proxy address with the address of the web application server. 1. All websites that use that default SSL should have the Require Server Name Indication box unchecked. Great info. Request URL mysite. Open IIS Manager Select the Versago Site on the left pane Mar 24, 2023 · For versions prior to BIG-IP 11. Feb 2, 2023 · Just wanted to check, what's the best way to rename the server name within IIS, have preinstalled IIS on the new 2022 Windows server no sites have been created yet, but will need to rename the server and IIS before we do. Recent convert to LetsEncrypt I need advice on how I should config IIS to use newly generated certs. This allows the server to present multiple certificates on the same IP address and port number. Jun 30, 2014 · Server Name Indication (SNI) is enabled on the site binding properties by clicking the Require Server Name Indication checkbox. When adding a new dev site and binding it to SSL I accidentally saved the binding without the [ ] Require Name Server Indication. c. This answer corrected my issue. sys implementation. In the Site Bindings window, click Add. Use different ports to host multiple web applications on the same IP address. On the Server Certificates page (center pane), in the Actions menu (right pane), click the Create Certificate Request… link Oct 31, 2012 · Here is what iis. Aug 15, 2023 · SNI is a feature that allows multiple websites to share the same IP address and port, while using different SSL certificates for each site. I don't know where is server name and how to expand Web Sites. Second, the SslFlag attribute on this has NOTHING to do with the SslFlags for Require Ssl. The way SNI does this is by inserting the HTTP header into the SSL handshake. When you go into IIS to edit the bindings of a site there's a check under the host name that says "Require Server Name Indication": This server doesn't have a "Main" site, in the future there will be atleast 5 more websites made with the same structure as the example above. mydomain,org:83 returns correct site on port 83. If you are serving more than one domain name from the same IP address, enter it in the Host name field and check the Require Server Name Indication box. Mar 19, 2019 · SSL Scalability with IIS 8 (Windows 8 Server) Server Name Indication (SNI) with IIS 8 (Windows Server 2012) As I discussed in my earlier posts, scalability was achieved in IIS 8 via Server Name Indication (SNI) and Central Certificate Store (CCS). Jul 18, 2024 · Each site has its own SSL certificate, so we need 2 for each full website. ที่หน้า IIS Manager คลิกที่ Server Certificates. Central Admin > Application Management > Manage Web Applications > New May 27, 2014 · Ideally, HTTP_HOST is the name of the Web server. Learn how to use SNI to host and scale secure sites on Windows Server 2012 with one IP address. Aug 23, 2022 · Site name: centralCert0. The name of the extension is Server Name Indication (SNI). The reasoning behind this was to improve SSL scalability and minimize the need for dedicated IP addresses due to IPv4 Apr 18, 2013 · Solving this limitation required an extension to the Transport Layer Security (TLS) protocol that includes the addition of what hostname a client is connecting to when a handshake is initiated with a web server. b. SNI reduced costs and made it easier to manage several domains without too much struggle. In the second post mentioned above I discussed in how scalability was achieved via SNI. Where is server name in IIS? Open the IIS console by clicking Start, then opening Administrative Tools, then Internet Information Services (IIS) Manager. SNI is a TLS extension that includes the hostname or virtual domain name during SSL negotiation. This allows for Server Name Indication (SNI) is an extension to the Transport Layer Security (TLS) computer networking protocol by which a client indicates which hostname it is attempting to connect to at the start of the handshaking process. Mar 22, 2023 · If you yourself are the operator of a web server, the situation is different because you may have to take action - depending on which web server you use: since IIS 8, Microsoft has integrated an option for server name indication into its software by default. I have a web application running on one server and use IIS with rewriteURL on another server as a reverse proxy. By default the Server SSL profile does not send a TLS server_name extension. 18 Windows and IIS "Require Server Name Indication" Setting. In the Server Manager, click Tools, and then click Internet Information Services (IIS) Manager. Require Server Name Indication is the option in Web Site Binding that allows binding multiple certificates to different websites with the same IP address: For such SNI bindings the ServerName header will be expected by the server. IIS > Sites > SharePoint Site > Bindings > Check/Enable "Require Server Name Indication" Create Apps Web Application. You can refer to the link below: Setting "require server name indication" with c# using Microsoft. We need IIS 8. The Apache HTTP server looks a bit different. Server Name Indication Jul 21, 2022 · I thought that order of precedence is IIS always checks if there are any hostname:port mappings first and if the SNI flag is sent by the client and the SNI flag is set on the server, it uses that binding. This may or may not be the same as SERVER_NAME depending on type of name resolution you are using on your Web server (IP address, host header). Feb 23, 2024 · The Server Name Indication (SNI) extension is a part of the TLS protocol that allows a client to specify the hostname of the server it is trying to connect to during the SSL/TLS handshake. Jun 7, 2018 · Hi Y’All I have 40 odd sites running under IIS 10. Oct 15, 2015 · Plesk 12. Jun 30, 2014 · Enabling Server Name Indication. It seems to me either that check is failing for some reason or it's order of precedence is IP:Port first. 4. Now enter the new name of the server. Host multiple web applications each on a unique IP address. However, this support is not enabled by default if the IIS website is using either or both of the following types of secure (SSL/TLS) bindings: Require Server Name Indication And obviously, IIS won't let you check "REQUIRE SERVER NAME INDICATION" on a blank binding, and if you try to manually set that flag on the binding in applicationhost. Select and Enable checkbox Require SNI hostname. Require Server Name Indication: If you are using Server Name Indication (SNI), check this check box. If you are deploying a web server in an Active Directory domain zone, create a DNS record on the domain controller. Both UCC certficates are from GoDaddy. X version installed on the WebServer along with the Centralized Certificate Store feature. Otherwise only one IIS site can run on port 443. Host Header on one IP. May 30, 2015 · I'm using Microsoft. Browsers that support SNI will immediately communicate the name of the website the visitor wants to connect with during the initialisation of the secured connection, so that the server knows which certificate to send back. 168. Now I have added an SSL certificate for each site and enabled Server Name Indication each site’s SSL binding. With a Server Name Indicator (SNI), the host name is exchanged as part of the SSL handshake. This is because the host header is not visible during the SSL handshake. In the center section, the name of website in IIS is listed in the Name column. 3. 0. A web server is frequently in charge of several hostnames, also known as domain names (the names of websites that are readable by humans). I did tick the box saying "Require Server Name Jun 25, 2012 · The SNI Readiness tool can be used by server admins to parse incoming HTTP traffic from the IIS W3C logs on the IIS server in order to determine the percentage requests that come from SNI capable clients. My question is, how can I have a host name on an https binding without requiring server name indication? Sep 12, 2020 · 如果你有接觸過 web server ，例如 apache 或是 nginx 或是 IIS，有個名詞叫做 virtual host 。意思是你可以在一台 web server 上面裝多個網站，可以讓 a. It uses that certificate. Click OK and Close. You can now host multiple TLS secured applications, each with its own TLS certificate, behind a single load balancer. mydomain,org returns default site on port 80. The server examines the server name specified by the client during the SSL handshake to determine, which server certificate should be used to complete the connection. 在 Windows Server 2012 上，IIS 支持服务器名称指示 (SNI)，它是一个 TLS 扩展，可将虚拟域作为 SSL 协商的一部分。 这实际上表示虚拟域名或主机名现在可用于标识网络终结点。 May 25, 2018 · Server Name Indication (SNI) is the solution to this problem. Generally, the best practice for IIS servers is to have *one* SSL certificate that can be considered as the default certificate on the server. I was getting errors like "New-Item : Cannot retrieve the dynamic parameters for the cmdlet", which ended up being related to the version of PowerShell being executed - as Installaware is a 32-bit app, it was executing the 32-bit version of PowerShell. However, the application allows users to download some content and redirects them to the download Toggle showing sub menu for My Products & Plans. Apr 22, 2024 · What is Server Name Indication (SNI)? Server Name Indication (SNI) is an extension of the SSL/TLS protocol that allows a web server to present multiple SSL certificates to a client, each for a different domain name hosted on the same IP address. xikinugededielbyardcwmomgijxpnvbgihfevwvnvzxjafzct