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Why does Windows need UDP connection from workstation UPD 138 and 389 to domain server it doesn't authenticate to?

Posted on 2006-06-13
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Last Modified: 2006-11-18
Our workstations authenticate to a local DC.  From analyzing network traffic, they also seem to connect to UDP 138 and 389.  I'm not sure why.  Can anyone provide good solid explinations?  The stations don't seem to work otherwise.
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Question by:awakenings
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by:awakenings
ID: 16897208
UDP 138 is just NetBIOS.  The UDP 389 is LDAP ping.  Why is that needed?  There are ACL's blocking.  Any reason why these serves provent the station from functioning?
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NJComputerNetworks earned 500 total points
ID: 16897221
not sure... maybe this other server is providing other services like GC.  Can you better explain your environment and setup.....

Need more details...
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by:awakenings
ID: 16897275
The other server was the first DC.  It is at another site.  The local server is at our site.  Both are the same domain.  Both are DCs.  The stations log in to the local DC as they should.  They have the UDP connection attempts to the far DC.  I'm trying to determine why.  There are denies on network syslog for those services and probably prevent some things like changing passwords, etc.  Any idea why?

Awakenings
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Author Comment

by:awakenings
ID: 16993818
I've got everything worked out.  I'll give you points anyway.
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Expert Comment

by:emaud
ID: 21830795
Hi awakenings
we are curious to know what was the problem?
Thanks
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