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VPN Ports for PPTP

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VPN Ports for PPTP - 16.Jul.2004 3:49:00 PM   


Posts: 14
Joined: 6.Apr.2004
From: Appleton, WI
Status: offline
Hi all, my current setup consists of a managed solution from AT&T (Packet filtering) and then my ISA 2004 firewall. I've asked AT&T to open port TCP 1723 to my ISA box, but I still cannot VPN in (won't authenticate). Is there a list of Ports (UDP and TCP) that the front firewall should have open to my ISA box? What are they?

Same with L2TP - what ports need to be forwarded?

Thanks much!

Post #: 1
RE: VPN Ports for PPTP - 16.Jul.2004 4:03:00 PM   


Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi Tim,

For PPTP, they also need to allow inbound GRE.

For L2TP/IPSec, they need to allow inbound UDP 500, UDP 4500 and UDP 1701.


(in reply to _Trip)
Post #: 2

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