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Domain Logins very slow all of a sudden

Single Forest, Single Tree, Single Domain
4 DC's , 2 at corporate 2 at data center, all 4 are GC and DNS
Domain is in 2008R2 mode both domain/forest.

Domain has been running fine for a year all of a sudden every login is taking 3 minutes.  The only information in event viewer on the clients I can find related is :"The winlogon notification subscriber <Profiles> is taking long time to handle the notification event "

DNS 'seems' fine .. replication seems fine.  What am I missing ?  Help !
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Mike Kline
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Is it taking that long for every user and every machine?   Any changes at all made anywhere?  

Take a look at the links in this blog (and the two I added with my comment)

http://adfordummiez.com/?p=86

What is the event number....I'll see if I can find any more information.

How does dcdiag look on your DCs?

Thanks

Mike
Please take a look at policy "Always wait for the network at computer startup and logon" under Computer Configuration\Administrative Templates\System\Logon

If enabled, disable it.
refer http://support.microsoft.com/kb/305293

You can also collect userenv logs and upload to diagnose issues issues using http://support.microsoft.com/kb/221833
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self solved