I run into the following error message on the execution of a FETCH action:
fatal: unable to access <...>: Unknown SSL protocol error in connection to <...>:443
such problem originated with the selection of the embedded GIT client (version 1.9.5),
bundled with the Sourcetree installation (version 3.3.6).
I previously installed on my PC a system GIT client (version 2.24.1).
Setting Sourcetree to use the latter solved the issue.
Hope this could be of any utility,