call to Watchguard, ask for support. Please handy with your watchguard Serial No and your contact informations.
they are glad to assist you.
Once i configured VPN between nortel contivity and watchguard.. they had proper documents step by step procedure to follow at both end devices.
I just sent email to watchguard support they called up me on my phone in 5 minute time.
So, contact them and ask for support they will give you.. sure.
And i am finding, i have partner login on watchguard site.. if i will find i will post you sure.
regards,
Dharmesh Purohit