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We've been running exchange server 2007 since February and just started having this problem this week. &nbsp;When anyone tries to log in to exchange, we cannot connect... Upon checking the event log, I see the following:<br />
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Event ID: 4001 Source: MSExchange System Attendant Mailbox<br />
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A transient failure has occurred. The problem may resolve itself in awhile. The service will retry in 56 seconds. Diagnostic information: Could not find any available Domain Controller.<br />
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Stopping and restarting the store fixes it for a while, but it happens again every couple of days. &nbsp; I've done some research and see that &nbsp;some have had this problem upon install and &nbsp;corrected the problem by disabling the checksum offload options on the servers NIC. &nbsp;I haven't done this yet, but would like to know why this has started on a server that has been running for 9 months.<br />
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Thanks<br />
Randy
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We've been running exchange server 2007 since February and just started having this problem this week.  When anyone tries to log in to exchange, we cannot connect... Upon checking the event log, I see the following:

Event ID: 4001 Source: MSExchange System Attendant Mailbox

A transient failure has occurred. The problem may resolve itself in awhile. The service will retry in 56 seconds. Diagnostic information: Could not find any available Domain Controller.

Stopping and restarting the store fixes it for a while, but it happens again every couple of days.   I've done some research and see that  some have had this problem upon install and  corrected the problem by disabling the checksum offload options on the servers NIC.  I haven't done this yet, but would like to know why this has started on a server that has been running for 9 months.

Thanks
Randy

MSExchange System Attendant Mailbox Event ID 4001

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.