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Allowing VPN access through Windows Firewall

Posted on 2007-12-05
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Last Modified: 2008-02-01
Ive got a laptop and a desktop at a clients house that won't allow a VPN connection to connect to the server at the office, everything the office end is fine and the router at the house is allowing VPN connections through.

when i disable windows firewall on the computers i can then connect to the VPN, ive tried allowing TCP ports 1701, 1723 and 47 and UDP port 500 but still havn't had a successful conection unless i disable the firewall.

i can connect to the server from our office fine with windows firewall enabled?
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Question by:pbrane
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by:from_exp
ID: 20412851
what firewall do you have on your laptop?
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Author Comment

by:pbrane
ID: 20413059
it was windows firewall, same as the desktop, which only worked when i disabled it, but now ive installed zone alarm but need to allow port 47 GRE before i test the connection again. the issue is definatly with windows firewall.
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Expert Comment

by:from_exp
ID: 20413081
and what type of vpn client do you use?
in most cases you should add that vpn application to allowed programs in windows firewall
and the same for zone alarm. just point zonealarm to a vpn program you want allow access to internet.
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by:pbrane
ID: 20413098
Windows XP to Server 2003 SBS. Strange though, that windows will not let through it own connection attempt even when added manually,
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by:from_exp
ID: 20413129
in sbs environment windows firewall is controlled via group policies on your DC. may be that's the problem
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by:pbrane
ID: 20418251
both the laptop and the desktop are now on a workgroup
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by:from_exp
ID: 20418351
ok, and have you been successfull with zonealarm?
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by:pbrane
ID: 20426584
ive still not tried with zone alram yet Is there any reason why windows firewall would not allow the traffic through though, even after opening the ports?
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Accepted Solution

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from_exp earned 1500 total points
ID: 20426658
actually there shouldn't be any reson for such misbehavior.
hm...
please go to windows firewall setting and set it reset to defaults (advanced tab)
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