VPN client can not connect to SBS 2003 running ISA 2004
Posted on 2009-02-11
I am new to ISA firewall, so bare with me. I am looking at a clients server who are having issues with clients conecting via VPN client
It gives an error 721 when it fails to connect.
Also the logs in ISA tell meYou were not connected because a duplicate name exists on the network.
RRAS logs in the Eventviewer
Event ID 20209 - A connection beetween the VPN Server and the VPN client has been established but the vpn connection cannot be established blah,blah common cause of this problem is GRE(47).
Using a DLink DSL-G604T modem, ISA box has 2 Nics.
apparently this has been working in the past and has since stopped for some reason.
It appears there is a rule defined in the ISA firewall for GRE 47 to allow through.