Ports used by PPTP

[Brad Eley]

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Greetings,
 I had an NT4 server with RRAS installed providing VPN support, and
opened the correct ports on our firewall to allow external access.
After an upgrade to Win2K, external clients are unable to login to
the VPN server, a situation that is similar to when we didn't have
the GRE prot. opened on the firewall originally. Internal clients
have no problems connecting, so I assume that M$ has changed/added
ports needed for a PPTP session? I'm sure this question has been
asked in the past, but the archive I went to didn't have search
functionality and I didn't feel like drudging through it all.
Thanks!

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