UDP is required. This is how the LDAP ping works with DC Locator and such.

Thanks,
Brian Desmond
[email protected]

w - 312.625.1438 | c   - 312.731.3132

From: David Lum [mailto:[email protected]]
Sent: Wednesday, December 01, 2010 3:44 PM
To: NT System Admin Issues
Subject: AD LDAP port 389 just TCP

For a system to talk to Active Directory LDAP does it need both UDP and TCP 
ports open, or just TCP?
http://support.microsoft.com/kb/832017

I did find a separate article that explains Kerberos uses UDP port 88 unless 
the packet is to big then it goes to TCP, but I am unable to get further detail 
on LDAP.

Reference for me anyone?
David Lum // SYSTEMS ENGINEER
NORTHWEST EVALUATION ASSOCIATION
(Desk) 971.222.1025 // (Cell) 503.267.9764


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