the short answer (which doesn't specifically answer your question, but does answer your problem) is that both answers are correct.
137-139 are used by the RPC EndPoint Mapper process in order to connect to the NTM Auth package. The RPCEM will use an arbitrarily high port for that process. ________________________________ From: Christopher Bodnar [christopher_bod...@glic.com] Sent: Wednesday, November 04, 2009 3:51 PM To: NT System Admin Issues Subject: NTLM authentication question Can someone give me a brief overview of the communication that takes place when a client falls back to NTLM for Domain Authentication after Kerberos fails? I’m interested in the ports it’s using not the actual handshake that takes place. I’ve read a few things that say its UDP 137, UDP 138, and TCP 139, others that it can be dynamic. All help appreciated. Thanks, Chris Bodnar, MCSE Sr. Systems Engineer Infrastructure Service Delivery Distributed Systems Service Delivery - Intel Services Guardian Life Insurance Company of America Email: christopher_bod...@glic.com<mailto:christopher_bod...@glic.com> Phone: 610-807-6459 Fax: 610-807-6003 ________________________________ This message, and any attachments to it, may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are notified that any use, dissemination, distribution, copying, or communication of this message is strictly prohibited. If you have received this message in error, please notify the sender immediately by return e-mail and delete the message and any attachments. Thank you. ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
