VPN not working when i connect through SBS 2003 server running ISA 2004

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Can you help?
I think my Server is blocking VPN?

My workstation is unable to connect to an external VPN Server when i connect
it through my SBS 2003 Server which is running ISA 2004 but if i connect
directly to my router i can VPN no problem. What is blocking me from
connecting to an External VPN server? if it is ISA or some firewall blocking
it from my Server how do i unblock it?

Thanks

Dave B


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