The network connection between your computer and the VPN server was interrupted. This can be caused by a problem in the VPN transmission and is commonly the result of internet latency or simply that your VPN server has reached capacity.
List of Error Codes that you may receive when you try to make a dial-up connection or a VPN connection in Windows 7
I suggest that you temporary disable the anti-virus and firewall. Then, try to connect to the VPN again. If the issue persists, temporary bypass the router, and try to connect. If the issue does not occur, there are some settings on the router cause this issue.