Hi, I have a problem with accessing OWA from a CAS server.
This is my setup
Site-A - EX1 (CAS,Hub,Mailbox)
Site-B - EX2 (CAS,Hub,Mailbox)
Users in Site B get the following error when accessing External OWA
The mailbox you're trying to access isn't currently available. Please try again in a few minutes.
Request Url: https://webmail.domain.com.au:443/owa/ev.owa?oeh=1&ns=HttpProxy&ev=ProxyRequest User: User Test EX Address: /o=organisation/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=User Test602 SMTP Address: User.Test@domain.com OWA version: 14.3.123.3 Second CAS for proxy: https://SITE-B.domain.internal/owa Exception Exception type: Microsoft.Exchange.Clients.Owa.Core.OwaProxyException Exception message: None of the CAS servers are respondingCall stack
No callstack available
Inner Exception Exception type: Microsoft.Exchange.Clients.Owa.Core.OwaAsyncOperationException Exception message: ProxyPingRequest async operation failed Call stack
Microsoft.Exchange.Clients.Owa.Core.ProxyPingRequest.EndSend(IAsyncResult asyncResult)
Microsoft.Exchange.Clients.Owa.Core.ProxyEventHandler.SendProxyPingRequestCallback(IAsyncResult asyncResult)
Inner Exception Exception type: System.Net.WebException Exception message: Unable to connect to the remote server Call stack
System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
Microsoft.Exchange.Clients.Owa.Core.ProxyUtilities.EndGetResponse(HttpWebRequest request, IAsyncResult asyncResult, Stopwatch requestClock)
Microsoft.Exchange.Clients.Owa.Core.ProxyPingRequest.GetResponseCallback(IAsyncResult asyncResult)
Inner Exception Exception type: System.Net.Sockets.SocketException Exception message: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 192.168.0.10:443Call stack
System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Int32 timeout, Exception& exception)
However, if irefreshthe browser OWA loads instantly with the mailbox displayed.
Following is logged in the eventvwr on the externally facing CAS Server;
Client Access server "https://webmail.domain.com/owa" tried to proxy Outlook Web App traffic to Client Access server "https://SITE-B.domain.internal/owa". This failed because "https://SITE-B.domain.internal/owa" didn't respond.
Additional information: webExceptionStatus=ConnectFailure.
Hope somebody can assist – thank you