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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)

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

How does dcdiag look on your DCs?


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.

You can also collect userenv logs and upload to diagnose issues issues using
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self solved