vpn access

M

Marius Kaizerman

On a Windows2000 server we've configured vpn pptp access.
From inside the network it is possible to connect to the vpn. The problem
is that it won't connect from outside the network (internet).
It begins the connection, gets to the poing where authentication is done,
and stops there.
Port 1723 is open, also protocol 47.

We made a test and configured a pptp vpn incoming connection on a XP machine
(which is on the same network as the win2k server), and surprisingly we
could connect
to it from outside without a problem.

What can be the problem with the server ?

Thanks.
 
R

Robert L [MVP - Networking]

What's the VPN error code? Also any error in the server Event Viewer?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
On a Windows2000 server we've configured vpn pptp access.
From inside the network it is possible to connect to the vpn. The problem
is that it won't connect from outside the network (internet).
It begins the connection, gets to the poing where authentication is done,
and stops there.
Port 1723 is open, also protocol 47.

We made a test and configured a pptp vpn incoming connection on a XP machine
(which is on the same network as the win2k server), and surprisingly we
could connect
to it from outside without a problem.

What can be the problem with the server ?

Thanks.
 
M

Marius Kaizerman

It gets to the stage of "Verifying username and password..", and after a minute or so
there's error 721 - the remote computer did not respond.
Event viewer on both client and server shows nothing.

Thanks.
What's the VPN error code? Also any error in the server Event Viewer?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
On a Windows2000 server we've configured vpn pptp access.
From inside the network it is possible to connect to the vpn. The problem
is that it won't connect from outside the network (internet).
It begins the connection, gets to the poing where authentication is done,
and stops there.
Port 1723 is open, also protocol 47.

We made a test and configured a pptp vpn incoming connection on a XP machine
(which is on the same network as the win2k server), and surprisingly we
could connect
to it from outside without a problem.

What can be the problem with the server ?

Thanks.
 
R

Robert L [MVP - Networking]

Sounds like router issue. I would upgrade the firmware first. These search results may help,

error 721 and error 800 System Error Codes ... Q: Error 721 and error 800. I have SBS 2003 Standard Edition. The server has two nic's for NAT on the RRAS. ...
www.chicagotech.net/Q&A/vpn25.htm - Similar pages


ras error code RAS Error Code. Cisco VPN Client Error/Reason Messages .... Case Studies – VPN error 721 and 800. Error 733: the PPP control protocol for this network ...
www.chicagotech.net/raserrors.htm


cannot establish VPN with error 721 and 800 System Error Codes ... Whenever he tries to establish the VPN, he receives Error 721 or 800. Troubleshooting: 1. Telnet port 1723 and get respond. ...
www.chicagotech.net/cisco/vpngre1.htm


case Studies - VPN error 721 and 800 System Error Codes ... Case 1: When a user attempts to access the Windows VPN server that is behind a Linksys WRT54G, he receives VPN Error 800 or 721. ...
www.chicagotech.net/VPN/vpncase800.htm



Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
It gets to the stage of "Verifying username and password..", and after a minute or so
there's error 721 - the remote computer did not respond.
Event viewer on both client and server shows nothing.

Thanks.
What's the VPN error code? Also any error in the server Event Viewer?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
On a Windows2000 server we've configured vpn pptp access.
From inside the network it is possible to connect to the vpn. The problem
is that it won't connect from outside the network (internet).
It begins the connection, gets to the poing where authentication is done,
and stops there.
Port 1723 is open, also protocol 47.

We made a test and configured a pptp vpn incoming connection on a XP machine
(which is on the same network as the win2k server), and surprisingly we
could connect
to it from outside without a problem.

What can be the problem with the server ?

Thanks.
 
M

Marius Kaizerman

I thought about it, but as I stated before, vpn connection to a XP machine which is on
the same network as the 2k server works flawlessly.
So I think it can't be a router problem.

Any other ideas ?

Thanks.

Sounds like router issue. I would upgrade the firmware first. These search results may help,

error 721 and error 800 System Error Codes ... Q: Error 721 and error 800. I have SBS 2003 Standard Edition. The server has two nic's for NAT on the RRAS. ...
www.chicagotech.net/Q&A/vpn25.htm - Similar pages


ras error code RAS Error Code. Cisco VPN Client Error/Reason Messages .... Case Studies – VPN error 721 and 800. Error 733: the PPP control protocol for this network ...
www.chicagotech.net/raserrors.htm


cannot establish VPN with error 721 and 800 System Error Codes ... Whenever he tries to establish the VPN, he receives Error 721 or 800. Troubleshooting: 1. Telnet port 1723 and get respond. ...
www.chicagotech.net/cisco/vpngre1.htm


case Studies - VPN error 721 and 800 System Error Codes ... Case 1: When a user attempts to access the Windows VPN server that is behind a Linksys WRT54G, he receives VPN Error 800 or 721. ...
www.chicagotech.net/VPN/vpncase800.htm



Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
It gets to the stage of "Verifying username and password..", and after a minute or so
there's error 721 - the remote computer did not respond.
Event viewer on both client and server shows nothing.

Thanks.
What's the VPN error code? Also any error in the server Event Viewer?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
On a Windows2000 server we've configured vpn pptp access.
From inside the network it is possible to connect to the vpn. The problem
is that it won't connect from outside the network (internet).
It begins the connection, gets to the poing where authentication is done,
and stops there.
Port 1723 is open, also protocol 47.

We made a test and configured a pptp vpn incoming connection on a XP machine
(which is on the same network as the win2k server), and surprisingly we
could connect
to it from outside without a problem.

What can be the problem with the server ?

Thanks.
 
P

patrick

May be a firewall issue. Check the firewall on the client machine.
Check the network firewall as well if the client is on a LAN.

Patrick
 
J

Janani Vasudevan

1) Is NAT configured on the server?
2) Check if firewall is switched on in the server.


--
Janani Vasudevan [MSFT]
Software Design Engineer/Test
RRAS, Windows Enterprise Networking

http://blogs.msdn.com/jananiv

RRAS blog: http://blogs.technet.com/rrasblog

[This posting is provided "AS IS" with no warranties, and confers no rights.]

I thought about it, but as I stated before, vpn connection to a XP machine which is on
the same network as the 2k server works flawlessly.
So I think it can't be a router problem.

Any other ideas ?

Thanks.

Sounds like router issue. I would upgrade the firmware first. These search results may help,

error 721 and error 800 System Error Codes ... Q: Error 721 and error 800. I have SBS 2003 Standard Edition. The server has two nic's for NAT on the RRAS. ...
www.chicagotech.net/Q&A/vpn25.htm - Similar pages


ras error code RAS Error Code. Cisco VPN Client Error/Reason Messages ... Case Studies – VPN error 721 and 800. Error 733: the PPP control protocol for this network ...
www.chicagotech.net/raserrors.htm


cannot establish VPN with error 721 and 800 System Error Codes ... Whenever he tries to establish the VPN, he receives Error 721 or 800. Troubleshooting: 1. Telnet port 1723 and get respond. ...
www.chicagotech.net/cisco/vpngre1.htm


case Studies - VPN error 721 and 800 System Error Codes ... Case 1: When a user attempts to access the Windows VPN server that is behind a Linksys WRT54G, he receives VPN Error 800 or 721. ...
www.chicagotech.net/VPN/vpncase800.htm



Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
It gets to the stage of "Verifying username and password..", and after a minute or so
there's error 721 - the remote computer did not respond.
Event viewer on both client and server shows nothing.

Thanks.
What's the VPN error code? Also any error in the server Event Viewer?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
On a Windows2000 server we've configured vpn pptp access.
From inside the network it is possible to connect to the vpn. The problem
is that it won't connect from outside the network (internet).
It begins the connection, gets to the poing where authentication is done,
and stops there.
Port 1723 is open, also protocol 47.

We made a test and configured a pptp vpn incoming connection on a XP machine
(which is on the same network as the win2k server), and surprisingly we
could connect
to it from outside without a problem.

What can be the problem with the server ?

Thanks.
 

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