Which ports does VPN open?

[quell]

Hi
I have a VPN established on my network. It works with all pc's except the ones with a firewall. Which ports do I need to open on their firewall in order for them to connect with the VPN software?
I am useing a Cisco 3.5.2 software with a PIX 515. I have looked in the PIX config and it says nothing about a certian port to use. I have also connected with the VPN and did a netstat -a on the client pc and it has a varity of different ports open when connected with the vpn. Does this happen on the PIX also?
The main issue is trying to figure out which ports to open on the clients firewall in order for them to connect to the VPN.
Thanks for the help in advance!

 

[smiffysnapper]

Hello,

Just been looking at this myself, you might want to look at the error 721 on win2K VPN. In there is all you need, especially look for bwilliams13...all will become clear.

Hope this helps

 

[yizhar]

HI.

Cisco VPN uses IPSec:
UDP port 500 (ISAKMP)
IP protocol 50 (ESP)

If the client is behind a firewall that implements PAT (Port Address Translation), then there is a problem to pass IP protocol 50, unless the firewall is IPSec aware and has special features for this.

Bye
Yizhar Hurwitz

http://come.to/yizhar

http://teachers.sivan.co.il/yizhar