We are having a strange problem here. We are running exchange 2003 sp2 on a2003 Server. At about 6:10 AM every Sunday morningOutlook looses connection to the server. We look at the server and it appears to be working fine and there are no errors in the logs. It's as if the stores are nolonger responding to requests. When we reboot the server everything is fine.This has been happening for about 6 weeks.We have four storage groups and under each one of those we have 4 message stores. Any ideas or suggestions would be appreciated.

We are having a strange problem here. We are running exchange 2003 sp2 on a2003 Server. At about 6:10 AM every Sunday morningOutlook looses connection to the server. We look at the server and it appears to be working fine and there are no errors in the logs. It's as if the stores are nolonger responding to requests. When we reboot the server everything is fine.This has been happening for about 6 weeks.We have four storage groups and under each one of those we have 4 message stores. Any ideas or suggestions would be appreciated. Hi there is no issue with applivation please check your hardware connectivity.biswajeet

We have a second exchange server and we have no problems with that. Both are running off our SAN.

Any maintanence being performed at that time? What about SAN? When you go into the management console are teh stores mounted?SF - MCITP:EMA, MCTS: MOSS 2007, OCS 2007, Exchange 2007

What else is running at that time? Backups? Av scans? IS online Maintenance? Other processes?

Check info: 1. Please describe the exchange topology 2. Which version of outlook do users use? Is it all domain users? 3. Which mode do users use, cache or online? 4. Does the issue happen to all mailboxes on the problematic exchange server? 5. Does the issue also happen when attempting to access the mailbox on that problematic exchange server via OWA? 6. Whats the detailed symptom on the client side after loose the connection with exchange server? Any event log in the application log on the client side? 7. Is there any error info if you reopen the outlook? 8. What shows in the Connection status? (Reference) 9. Please follow KB 821912 for troubleshooting 10. Please run ExBPA against the problematic exchange server for a health check

It appears it has something to do with the anti-virus. Althought we have nothing scheduled to run. We are going to call the vendor today to discuss. thanks for your suggestions. If that's not it, I'll be back.

Sure. Please post at here if there's any further update. Thanks!

We have a very similar problem except our happens on Thursdays at 10:40AM and we are running Exchange 2007 SP1 Rollup 7. Other than the obvious differences, it sounds nearly identical. At first I thought it was related to Antivirus (Trend Micro Scanmail) because of the regularity however we have disabled the AV scan and the problem still continues. I am now leaning toward the Scalable Network Pack hotfix but all SNP features are already disabled (on the NIC and registry) . According to some of the errors it might be a memory leak (the hub transport servers are unable to deliver mail due to RPCOutofMemory. I am aware that Rollup 8 and 9 have fixes for this but if it were a memory leak, it doubt it would happen with such regularity.