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ISA 2006 outbound pptp

Last Modified: 2012-05-05
Dear experts,
Im behind of ISA 2006 gateway. When I dial to VPN server from my windows XP workstation over PPTP I got user name password verification dialog box and then  error 619 port used to this connection was closed.  PPTP out bound is open, and which ports do I need to open to connect to VPN. And how to check GRE is enable on ISA 2006.

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