We have a ZyWall 50 router. From a client laptop behind this we are trying to make a VPN connection to a remote server. When the connection attempt is made we get an error 800 on the laptop.
When I check the router logs there is an error I reckon is related to this:
Packet without a NAT table entry blocked: ICMP(type:5, code:1)
This error is logged every time we try to connect using the XP VPN client. This worked a few weeks ago, and nothing I can think of has been changed on the router.
HAs anyone got any idea what could be the problem?