MSExchange ADAccess Event ID’s 2601, 2604, 2501


communication brain_blogMSExchange ADAccess Event ID’s 2601, 2604, 2501

After a reboot of of Exchange 2010 server that resides on a Windows 2008 R2 server, the following events are logged in the Application Log

Log Name: Application
Source: MSExchange ADAccess
Level: Warning
Event ID: 2601

Log Name: Application
Source: MSExchange ADAccess
Event ID: 2604
Level: Error

Log Name: Application
Source: MSExchange ADAccess
Event ID: 2501
Level: Error

A NetLogon error of 5719 might also be seen in the Application Log.

 

While this article points out that this can be a normal occurrence it doesn’t explain why this is:

Today’s switches and NICs have advanced protocols that enable allot of really great functionality as well as stability, unfortunately many times that comes at the cost of negotiation time.

Here are some things you can do to remedy the issue

  1. Enable functions like “port Fast” on your switch
  2. Disable advanced functions on the switch (such as spanning tree)
  3. Disable advanced functions on the NICs.
  4. Delay the service startup (properties of the service –> startup type)
  5. Configure Recovery options on the properties of the service to force it to restart the service.
  6. In extreme cases you can make a service dependant on another service.http://support.microsoft.com/kb/193888

NOTE: disabling some services on a switch can put you at risk for things like network loops, so document your changes and weigh the pros and cons.

One thought on “MSExchange ADAccess Event ID’s 2601, 2604, 2501

  1. Pingback: Fix 2501 Errors - Windows XP, Vista & Windows 7, 8

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