Frequent drops and restore connections to Exchange server
Hi All, We have exchange server installed on windows server 2008 and all client machines are windows XP professional. few days ago weird problem started with outlook on all client machines ( around 25 of them ). every 10 or 15 minutes i see following messages. 1. Connection to the Microsoft Exchange Server has been lost. Outlook will restore the connection when possible. 2. Connection to the Microsoft Exchange Server has been restored. We initially thought it may be NIC on server dropping the connections. We changed it and the problem still persists. Also if I remotely login into server using remote desktop it drops connections as well. I turned off windows firewall and anti virus software and still it drops connections. What could be the problem? Any help? Thank You, Parin
September 21st, 2012 11:34am

Anything in the Exchange app or system logs? Sound like a hard network drop than an app related error. Could be multiple issues including arp entry getting lost on your switches. Try to put it on a different switch.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com
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September 21st, 2012 7:07pm

Anything in the Exchange app or system logs? Sound like a hard network drop than an app related error. Could be multiple issues including arp entry getting lost on your switches. Try to put it on a different switch.James Chong MCITP | EA | EMA; MCSE | M+, S+ Security+, Project+, ITIL msexchangetips.blogspot.com
September 21st, 2012 7:18pm

Hi Did you follow what James told to check application logs on exchange servers to see if there are some warnings or errors. Also, you can try the solution provided on below link http://forums.msexchange.org/Connection_Lost_and_Connection_Restored_messages_-_Don't_see_a_problem%3F/m_1800545647/tm.htm It said "Also Check all the exchange servers and see how many NICs there are, If any are disabled or unplugged and make sure the enabled ones are at the top of the network bindings in Windows." Hope that could help CheersZi Feng TechNet Community Support
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September 24th, 2012 4:36am

Hi Did you follow what James told to check application logs on exchange servers to see if there are some warnings or errors. Also, you can try the solution provided on below link http://forums.msexchange.org/Connection_Lost_and_Connection_Restored_messages_-_Don't_see_a_problem%3F/m_1800545647/tm.htm It said "Also Check all the exchange servers and see how many NICs there are, If any are disabled or unplugged and make sure the enabled ones are at the top of the network bindings in Windows." Hope that could help CheersZi Feng TechNet Community Support
September 24th, 2012 4:37am

No useful information in the exchange app or system log. I will try with different switch once I get it. But I noticed one thing. we have around 30 users that connects to exchange server everyday. But one day few of them were absent and I did not see any problem. But the other week as they returned problem started again. Is this something related to no of users accessing exchange? If yes how can I increase the count?
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October 3rd, 2012 8:50am

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