Yesterday i had a problem with my clients being unable to connect to our Exchange server with the mobile devices and I fixed that probelm but now when my clients try to connect to the Exhcange server through the internet using RPC/HTTP in the Outlook they are unable to connect. When I run a test for functionality at this site: https://www.testexchangeconnectivity.com
The test fails. with this message
Testing HTTP Authentication Methods for URL https://mail.doaminname.com/rpc/rpcproxy.dll
The HTTP authentication test failed.
Message: The underlying connection was closed: The connection was closed unexpectedly.
What do I need to do now to get this fixed?