VPN Client versions tried 4.x and 5.x
VPN Endpoint Cisco 3005
Profile - Group Authentication / Transparent Tunneling TCP 10000
Works just fine on every network tested except one.
Wireshark packet capture during initial setup.
On working networks, DNS resolves then immediate syn/syn-ack/ack to TCP 10000 then IKE like its supposed to.
On this one network, DNS resolves then a UDP to 62515 and no response from VPN concentrator. What I can't figure out is how the client is deciding to send TCP or UDP initially. I see no other traffic. Boggled right now.