<ul><li>Starting from April 23rd, 2025, Server Name Indication (SNI) will be mandatory for all incoming HTTPS connections to Azure DevOps Services.</li><li>SNI is an extension to the TLS protocol that allows clients to specify the hostname they are connecting to.</li><li>Some client software may be incompatible with SNI, causing connection errors such as ERR_SSL_PROTOCOL_ERROR or javax.net.ssl.SSLHandshakeException.</li><li>To test SNI compatibility, users can call the status endpoint of Azure DevOps or temporarily override DNS settings when testing legacy software.</li></ul>

Important Update: Server Name Indication (SNI) Now Mandatory for Azure DevOps Services

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