Meaning

This warning indicates that your local VPPPN client is configured for port forwarding but and does not match the current state of the network.
By default VPPPN will determine your network, but if you manually override the configuration in the file application-config.xml to indicate that you are using a fixed IP address or a fixed port this error can occur.

Cause

If the DHC server recognises that messages from you do not originate from your configured IP or port the VPPPN client will present this warning.
This is probably caused by one of these issues.

  • Incorrect port forwarding settings.
    • The settings in the application-config.xml file on your computer do not match the router config.
    • The fixed port you have chosen is no longer configured in your router.
    • The fixed IP address you have configured is no longer valid.
  • The local DHCP server has assigned your PC a different IP address.
  • The MAC address of your network card has changed, either a new network card, or connecting via wireless instead of cable.
  • Your PC (or laptop) is temporarily attached to a different network.

Solution

You may be able to continue but you should correct your local configuration or it may prevent people from being able to connect to you.
Fixed IPs and/or fixed ports are a much more reliable configuration in the long run. If you are sure that your application-config.xml file is correct you should check to see that the router is correctly setup for port forwarding.
Verifying port forwarding can be done using the UDP Ping Test service

If your PC (or laptop) is temporarily on a different network you can set the value of the port-type in the application-config.xml file to "STUN" (uppercase).
<port-type value="STUN" />