Hi All, Up until approx. 5 days ago everything was working fine. I'm running Exchange 2000 on Windows 2000, both products have the latest security updates. The Exchange server is located in the parent domain. I have two child domains. Outlook mail and webmail for users in the parent and child1 domain is working fine. Users in child2 domain can not get in to their mail via Outlook or webmail, it just hangs. I've had them ping the mail server and it resolved fine. They can see shares on the Exchange server and all other servers. They can run other programs located in the parent domain (ie as400), just not email. My user id is in the parent domain. When I RDP to a machine in child2 and try my webmail, it does the same thing!! I've checked for event viewer errors on the chance that replication isn't working properly but everything seems fine. Nothing changed 5 days ago. I'm totally stumped on this one. I've tested every scenerio I can think of with no luck..... Any thoughts on this would be GREATLY appreciated. Thanks so much! Candie