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New Member

PPTP Problem

Basically we have a remote office and we from there we have a ADSL line. We configured Microsoft PPTP VPN to connect to our Head Office. We have PIX 525 at our head office which is terminating the VPN connections. The problem is we are not able to establish a multiple VPN session, only one machine can connect and the others are not.

Cisco Employee

Re: PPTP Problem

is this PPTP terminating on Pix ?

Can you paste the config here


Re: PPTP Problem

that's how PPTP works especially if your

windows PPTP machines are behind a "hide"

or "PAT" device. Use static nat 1-to-1

if you want multiple windows machine to

connect to your Pix via pptp.

CCIE Security

New Member

Re: PPTP Problem

VPN is terminated on a PIX 525 FW.

Is there any work around to solve this issue aside from using 1-to-1 NAT? How about using Cisco VPN client?


Re: PPTP Problem

With Cisco VPN client, I think it is possible

because if you enable NAT-T (aka udp-4500),

in theory, it should work with multiple

VPN client machine behind a "hide" NAT or

"PAT" device because it's UDP. However,

I've never tried it because I never have to

implement it in a production environment.

Problem with PPTP is that you have to pass

both GRE and tcp port 1723 and GRE is the one

causing problem for multiple clients behind

a PAT device.

CCIE Security

New Member

Re: PPTP Problem

Hi cisco24x7, We tested it using Leased Line and all clients are able to establish a VPN connection simultaneously.