Dear NC, i am unable to edit the CAS Server virtual directories settings and CAS Server settings like "outlook anywhere" from the Exchange ECP. I get the following errors: The version of Internet Information Services (IIS) that is running on server 'CAS01.domain.tld' can't be determined. This error can occur due to network connectivity issues. Check the availability of your network and try again. Parameter name: Server and An error occurred while accessing the registry on the server "CAS01.domain.tld". The error that occurred is: "the network path was not found. ". At the same time i get following Warning entry in the Event Log: ID: 1309, ASP.NET 4.0.30319.0 Event code: 3005 Exception information: Exception type: HttpException Exception message: the client has disconnected the connection. bei Microsoft.Exchange.HttpProxy.ProxyRequestHandler.EndProcessRequest(IAsyncResult result) bei System.Web.HttpApplication.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) I have a fully new clean and fresh installation with 1 ADS, 1 MBX and 1 CAS Server all running on Windows 2012 Server Standard. Editing the MBX Servers settings works fine.

Hi , Please check the network connection and check the services on the CAS01. The similar issue for your reference. Error when accessing Server Configuration Properties: http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/25b2ee5f-9b20-403d-8287-7f854dc61ebf/ Wendy Liu TechNet Community Support

I solved it by myself by enabling Ports 137-139 and 445 (Netbios, SMB) in the Windows Firewall.

Thanks a lot Bernd Oliver its saved my lot of time... It works by opening port 445 in NLB node.