ERR_SSL_VERSION_OR_CIPHER_MISMATCH error when connecting to an outdated VisualSVN Server installation

Applies to: VisualSVN Server 1.0, 1.1, 1.5, 1.6, 1.7, 2.0, 2.1, 2.5, 2.6, 2.7, 3.0


You may receive the following error message in a web browser when connecting to an outdated and unsupported version of VisualSVN Server:

Google Chrome, Microsoft Edge and other Chromium-based browsers

The connection for this site is not secure uses an unsupported protocol.

Mozilla Firefox

Secure Connection Failed
An error occurred during a connection to Peer using unsupported version of security protocol.


Due to TLS 1.0 and TLS 1.1 deprecation, modern browsers can only connect to servers that support TLS 1.2 or higher. VisualSVN Server supports TLS 1.2 beginning with version 3.2.0. Versions older than 3.2.0 do not support TLS 1.2.


You should upgrade the VisualSVN Server installation to a newer version to solve this issue.

Up-to-date versions of VisualSVN Server support TLS 1.2 and TLS 1.3. Upgrading the server to the current version will resolve the issue and web browsers will connect without errors.

See also

KB174: Upgrading to VisualSVN Server 5.0
KB195: Understanding TLS/SSL compatibility levels in VisualSVN Server
KB196: Changes to TLS/SSL compatibility levels related to the deprecation of TLS 1.0/1.1

Last Modified: