A company that we work with have given us their cicoVPN client to get into
their system. We have a sonicwall at our end. Out sonicwall has all
outgoing allowed but strict rules for incoming. What ports do we need to
open for incoming to get the ciscoVPN to work from our end?
Here is a list of ports that seem to be relevant and that you can open
UDP port 500 (IKE, Internet Key Exchange)
IP Protocol 50 (ESP)
IP Protocol 51 (AH)
UDP port 10000 (IPSec encapsulated in UDP)
TCP port 443 (IPSec encapsulated in TCP)
UDP port 62515
UDP port 4500
You should experiment a bit and see what the minimum list is for VPN to
work for your set-up.