What port is used to login to Windows?

I have a site with no DC and users authenticate across a point-to-point VPN tunnel. I believe the port is being filtered by a piece of hardware and I need to know what port it is that I should be seeing in my packet capture. Any info would be helpful.
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Mike KlineCommented:
Look for 389, 3268, 88, 54, 445, list to look at here  http://technet.microsoft.com/en-us/library/dd772723(WS.10).aspx


The key to successful tunneling using PPTP is the ability of the ISPs involved to support Protocol 47 and Port 1723

pamplinitAuthor Commented:
I found out that a piece of Hardware - Link Load Balancer from Barracuda was filtering the ports. After a quick reboot I was then able to get through. Thank you for your help.

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pamplinitAuthor Commented:
Upgrades to software.
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Windows Server 2003

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