PPTP passthrough on 1841

Unanswered Question
Jul 27th, 2010

Hello,

I am behind a 1841 firewall and it seems that GRE is not configured to passthrough the router and is causing me issues connecting to Windows VPN.  Can someone point me to a document or let me know what ports I need to open etc.

Thanks.

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Reza Sharifi Tue, 07/27/2010 - 17:57

Hi Jeff,

I think for IPSEC over GRE tunnel ISAKMP utilizes UDP port 500. Try allowing it through the firewall and test again. 

HTH

Reza

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