It looks as though the wrong version of TLS has been selected. Using a Web browser to reach the site you should be able to find out the version in use by looking at the security settings (the little padlock alongside the URL in Chrome, for instance).
You can enable the HTTP/SSL debug in Workstation (under the help menu) to see what is being used.
You could also try adding the following to your Workstation.vmoptions file, on a line of its own
-Dhttps.protocols=TLSv1,TLSv1.1,TLSv1.2
and see if that resolves your problem. If so, you would need to put the same entry in your other vmoptions files, as appropriate.
If this does not work for you, perhaps you could post the debug information and let us know what version of DevTest you are using