SOLUTION: TMG OWA Publishing Error: Status: 70 The remote server has been paused or is in the process of being started

Applies to: Threat Management Gateway 2010, Exchange 2013

Problem:
You want to publish Exchange 2013 OWA via TMG using web farm consists of more than one Exchange 2013 CAS Servers. Allowed necessary ports on firewall, created listeners, installed certificated etc. But when you try to test https://mail.contoso.com/owa you got the following error in the browser:

Status: 70 The remote server has been paused or is in the process of being started.  

On TMG log:

Failed Connection Attempt TMGSERVER1 1/17/2016 10:30:20 AM
Log type: Web Proxy (Reverse)
Status: 70 The remote server has been paused or is in the process of being started.  

Cause:
When you configured web farm connectivity verifiers are also created. All connectivity verifiers that check the connection to Exchange CAS servers are in time out state due to invalid Current URL setting in the verifier. Therefore TMG does not allows client to connect to unreachable CAS servers.

Resolution:
1- Using TMG Console, click Monitoring and go to Connectivity Verifiers tab.
2- Find all the newly created Connectivity verifiers and double-click it. (There should be one for each TMG server in array)
3- Connectivity Verification tab, click configure add S to link (should be https not http) that is it should be: https://*/OWA/  (which is default)

wait for default time out (5000 millisecond). If the connectivity verifier in good state or xx msec state, then the error will gone and client can connect.

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