Nimbostratus
We haven't seen this particular error before -- where exactly are you seeing it? Before ever getting to the login page, or after logging in but before getting to the Mailbox view?
Some things to check:
Did you by any chance change the URI for reaching OWA (within the context of the iApp template)? The question immediately follows the one about if you're deploying OWA; you should really leave that at the default value -- we default that to "/owa/".
Is your OWA pool actually listed as available (green) by BIG-IP LTM? If not, What type of monitors are you using -- simple or advanced?
If using Advanced monitors, what Auth method are you using for OWA -- forms-based or Basic/Integrated? If forms-based (default), did you specify that correctly in the iApp template monitor section, and also follow the requirement to change the credential format on each CAS server from 'domain\username' to just 'username'?
Lastly, did you remember to make the External URL for both Outlook Web App and Exchange Control Panel 'https:///owa' (where is your client-resolvable DNS name, of course) rather than 'https:///owa'?
Let us know about these items and, if none of those are the culprit, we can suggest some further troubleshooting steps.
