PPTP-VPN from Win XP-SP2

[kabimas]

We have configured PPTP-VPN in two routers Cisco, they have worked very well for many months, when our clients were using PCs running Windows 2K, and Win XP-SP1.
Since they upgraded their PCs to WinXP Service-Pack 2 our problems began. None of them can establish a PPTP-VPN connection to our routers.
During our tests we have seen we can establish VPDN connections to these routers from PCs running Win2k, Win98 and WinXP-SP1 but NEVER from Win XP-SP2 ones. When we try with XP-SP2 PCs we always get an “error 619”.
We have opened UDP 62515, TCP 10000 and TCP 4500 ports at our Win XP-SP2 ws, we have turned off the Windows Firewall but we have never established a PPTP-VPN connection from them.
Please, Could any of you give us some ideas about How to fix this problem ???
Thank You

 

[tonymce]

i know this sounds stupid but is it your virus scanner.
I have mcaffee and it blocks loads of ports only on sp2 i know it sounds strange but it does..
Worth a look

 

[crashuk]

well i would vpn in the same network if you can then its a router issue, if i cant then ill start by using ip address not unc path,
but you need to open port 1723 open and support the TCP/IP protocol #47 (GRE).
firewall must be configured to allow a pptp vpn connection from your computer. A pptp connection requires port 1723 and support for the TCP/IP GRE protocol (protocol # 47).