Exchange 2013 RPC URL shows Error 404 Page Not Found

Hi,

I have been told by Barracuda Support to verify my Exchange 2013 RPC url is working correctly using the following address in a Web Browser: 

https://RoH server address/rpc

When I hit this URL I input my credentials and get a Error 404 - Page Not Found. 

I dont have any issues with Outlook Anywhere and clients are working fine. The tests come from this article and I am wondering if they are still valid for Exchange 2013 so need some help:

https://techlib.barracuda.com/BMA/EnableRoH

Does anyone else get the 404 error when they try the RPC virtual directory? If I got rpc/rpcproxy.dll that works fine and no issues. 

We have Outlook Anywhere configured for NTLM authentication so maybe this is an issue and should be Basic?