However, if the ISA Server is not the problem, have you verified that your Domain Name System (DNS) host record still points to the correct IP address of your network?
For example, if you use https://mail.yourdomain.com/exchange as your OWA URL, make certain that mail.yourdomain.com resolves to the public IP address of your network (typically the firewall).
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Dig deeper on Outlook Web Access
Related Q&A from Bradley Dinerman
Find out how you can avoid DNS issues related to a Exchange 2003 server only collecting email from specific POP3 domains.continue reading
Are you having trouble with duplicate appointments in your Microsoft Outlook 2003 calendar? Learn what may cause this to happen.continue reading
Learn the best way to configure the default recipient policy in an Exchange 2003 test environment.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.