I'm trying to create a connection from ArcCatalog 10.2.1 on the desktop to ArcGIS For Server 10.3. I've found varying information as to whether this is possible or not. The error I'm getting is:
We were unable to connect to:
Error: Proxy server got bad address from remote server (verify the server is running).
and the server is up. So, can I create a connection between these with mis-matched versions? If so, what should I look at next?