Hi, I have encountered intermitten problem with my Exchange 2003 OWA. I have setup 2 OWA servers using NLB at the DMZ. My owa servers also serves as SMTP. Ocassionally, my OWA server will go down. Even restarting all services cannot help. Both OWA will down at the same time. Until I restart both servers, then the OWA is back running again. I would like to know what could be the possible cause to this. I have the the IIS log but could not find anything at the time it happened. Please advise. Thanks. Regards, Alan