Home > Tips & Tricks > The client and server cannot communicate, because they do not possess a common algorithm

The client and server cannot communicate, because they do not possess a common algorithm


I recently faced an interesting issue when trying to fetch data from third-party API. When trying to connect to the API endpoint, I received the following error message:

“An error occurred while making the HTTP request to https://<API endpoint>. This could be due to the fact that the server certificate is not configured properly with HTTP.SYS in the HTTPS case. This could also be caused by a mismatch of the security binding between the client and the server.” Inner exception was “Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.”

Solution :

The issue came up when we setup a Thycotic Secret Server on a hardened OS. On the OS TLS 1.0 was disabled for security reasons, however at the moment the used Microsoft SQL server didn´t speak TLS 1.1 or TLS 1.2. So the error message:

A connection was successfully established with the server, but then an error occurred during the login process. (provider: SSL Provider, error: 0 – The client and server cannot communicate, because they do not possess a common algorithm.)

After TLS 1.0 was enabled on the Thycotic Server the installation could be performed without issues. So make sure that your Microsoft SQL environment is up to date and supports TLS 1.1/1.2 if you wish to disable TLS 1.0.

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