The transparent tunneling mode you select must match the mode used by the VPN device providing your connection to the private network.
If you select IPSec over UDP (NAT/PAT), the default mode, the port number is negotiated.
If you select TCP, you must enter the port number for TCP in the TCP port field. This port number must match the port number configured on the VPN device. The default port number is 10000.
Note: Either mode operates properly through a PAT device. Multiple simultaneous connections might work better with TCP, and if you are in an extranet environment, TCP mode is preferable. UDP does not operate with stateful firewalls. Use TCP with this configuration.
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