My exchange server is really suffering at the moment. I do not know what has happened but when I connect via https (ECP/OWA) or via outlook (with in the network) I get 503 errors on ECP/OWA and Disconnected/Trying to connect in Outlook. I assume it is the same issue for both.
I think Exchange itself is OK, because I can use IMAP to send/receive emails. So I think it is something to do with the IIS configuration.
I get the 503 error when I log in. I get the log in page, but after logging in (correct username/pwd) then I get a blank screen with the error in the console (chrome browser). The only thing I have done today was to try a new SSL certificate, but had issues with the internal domain and external domain. I have put the SSL certificate for IIS Default site back to "Microsoft Exchange" However, it was all working when I finished this. I tested two client machines to ensure it was working.
The app pools all seem correct and are running under local admin. I have tried swapping the certificates back again, just in case, but no effect.
I have tried every combination of google search possible which has lead me to try the things I have said in the post. Unsure why it was downvoted, very unhelpful without any constructive comments.
I am now very much at a loss.
Here is some of the IIS log:
2015-07-22 23:04:36 192.168.16.3 RPC_IN_DATA /rpc/rpcproxy.dll 21ad25c4-4c9d-4367-b673-4ae3e772253e@company.org.uk:6001&CorrelationID=<empty>;&RequestId=1e098a25-e9c7-4229-b6b8-7aeb35633d87&cafeReqId=1e098a25-e9c7-4229-b6b8-7aeb35633d87; 443 - 192.168.16.35 MSRPC - 401 1 2148074254 1
2015-07-22 23:04:36 192.168.16.3 RPC_OUT_DATA /rpc/rpcproxy.dll 21ad25c4-4c9d-4367-b673-4ae3e772253e@company.org.uk:6001&CorrelationID=<empty>;&RequestId=4c1a6653-5f3b-4485-b4e2-03e59dc533be&cafeReqId=4c1a6653-5f3b-4485-b4e2-03e59dc533be; 443 - 192.168.16.35 MSRPC - 401 1 2148074254 3
2015-07-22 23:04:36 192.168.16.3 RPC_OUT_DATA /rpc/rpcproxy.dll 21ad25c4-4c9d-4367-b673-4ae3e772253e@company.org.uk:6001&CorrelationID=<empty>;&RequestId=4c22cf89-4716-4ff2-b509-1abc2e7454b8&cafeReqId=4c22cf89-4716-4ff2-b509-1abc2e7454b8; 443 RBC\bates 192.168.16.35 MSRPC - 503 0 64 44
2015-07-22 23:04:36 192.168.16.3 RPC_IN_DATA /rpc/rpcproxy.dll 21ad25c4-4c9d-4367-b673-4ae3e772253e@company.org.uk:6001&CorrelationID=<empty>;&RequestId=aae0ff8d-28d2-4c3d-8b76-7949291676e3&cafeReqId=aae0ff8d-28d2-4c3d-8b76-7949291676e3; 443 RBC\bates 192.168.16.35 MSRPC - 503 0 64 167
This seems to be related (it is the 503 error)