Hello, 

I have an Exchange 2013 Installation with 2 CAS , 2 MBX and LNB infront. Mailfow working perfect , OWA the same. From internal and from external. My problem is with the Outlook Anywhere.

I use testconnectivity website from microsoft and it passes all tests except the last one. The error is

Testing HTTP Authentication Methods for URL https://mail.domain.net/rpc/rpcproxy.dll?c738e8d9-40c7-4b18-a128-f1a95f43ae3a@domain.net:6002.
	The HTTP authentication test failed.
	Additional Details   A Web exception occurred because an HTTP 501 - NotImplemented response was received from Unknown. Headers received: Pragma: no-cache Content-Length: 29 Cache-Control: no-cache,no-store Content-Type: text/html Expires: now Elapsed Time: 615 ms.

Any ideas ?

Thanks

Hi

Check your settings for outlook anywhere by running the following command from the Exchange Management Shell: get-outlookanywhere

If they set to Negotiate change the settings to Basic and NTLM using set-outlookanywhere command.

Hi !

I have already change this settings to Basic and NTLM but i get the same error. It seems that my load balancer is the reason. If i bypass it then outlook anywhere works perfect. With the loadbalancer online i have the specific problem .

Hi,

If you don't mind, I suggest using  DNS round robin instead of NLB.

Found an article for your reference:

Exchange Server 2013 Client Access Server High Availability

http://exchangeserverpro.com/exchange-2013-client-access-server-high-availability/

If NLB is unnecessary, we can just bypass the NLB.

Hope it is helpful

Thanks

Mavis