We are running a git server over https and didn\'t have any trouble connecting because we all used visual studio to do so. Now someone wants to use the standard git bash and
Verify that you are using TLS 1.0 or above. Some servers require TLS 1.2. If you are not sure that your server supports up to TLS 1.2 look at Steffen Ulrich's answer above and try that first.
If that does not help, then check if SNI is required for the endpoint. If that is the case this might be the problem. If you call the s_client command with the servername parameter set to the servername which you'd like to contact that should work.
Example basic command:
s_client -connect example.com:443 -tls1 -servername example.com
You can find the options for s_client at s_client man page.