VPN drops frequently



Hi All, could someone please shed light on the following problem,
driving me bonkers!

I have a VPN client connection to a Watchguard SOHO 6tc firewall router
external I.P 83.141.xxx.xx
This is on a broadband line which internet etc seems to work fine.

Behind the router is a server 2003 box with IP address 192.168.0.1
The default gateway is the router/firewall 192.168.0.200

I can connect fine to the VPN and it works ok for about 5 minutes
(sometimes shorter)

If I run a ping -t 192.168.0.1 from my client PC at home it works fine
for a few minutes then drops the connection. This will not reconnect
unless I re-try with the client.
NB: This doesn't matter if there is traffic on the VPN tunnel or it is
just sitting idle.

My home PC is windows XP SP 2 and has the firewall enabled with ports
1723 TCP, 51 TCP and 500 UDP.

I runa belkin wireless router at home also and have opened the ports up
on this aswell using the virtual server feature on the web interface of
the modem.

(Note: this is probably an irrelevant setting as the dropping of
connection seems to be the same for all home clients who are trying to
keep a connection)

Can anyone help with what this may be?
I'm open to all suggestions.....

Cheers
Craig Mrbungle50

PS: Can anyone let me know how to connect this firewall as a permanent
VPN between itself and a Cisco 828 box? we have this box in the states
and I wanta permanent link set up between the two.
both have fixed external IP and differing internal IP subnets.

.



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