Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

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
5
373 Views
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.
0
Comment
Question by:awakenings
  • 3
5 Comments
 

Author Comment

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?
0
 
LVL 33

Accepted Solution

by:
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...
0
 

Author Comment

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
0
 

Author Comment

by:awakenings
ID: 16993818
I've got everything worked out.  I'll give you points anyway.
0
 

Expert Comment

by:emaud
ID: 21830795
Hi awakenings
we are curious to know what was the problem?
Thanks
0

Featured Post

Ransomware-A Revenue Bonanza for Service Providers

Ransomware – malware that gets on your customers’ computers, encrypts their data, and extorts a hefty ransom for the decryption keys – is a surging new threat.  The purpose of this eBook is to educate the reader about ransomware attacks.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This may not be a text book method to resolve VSS backup issues but it seemed to have worked on few of the Windows 2003 servers we had issues while performing a Volume Shadow Copy backup. If you have issues while performing a shadow copy backup usin…
Setting up a Microsoft WSUS update system is free relatively speaking if you have hard disk space and processor capacity.   However, WSUS can be a blessing and a curse. For example, there is nothing worse than approving updates and they just have…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question