MSN can not login via VPN PPTP with MPPE

willstone · 08-25-2008, 03:33 AM

Hi,
I meet this problem that a pptp client dial up to PPTP server opened mppe, msn can not login via this pptp connection.
But if closed the mppe, msn can login sucessfully.
Someone can help me?Thanks.

Linux version 2.6.16.26
pptpd v1.3.0
pppd version 2.4.4
Windows Live Messager 8.5

TB0ne · 08-26-2008, 09:20 AM

Quote:

Originally Posted by willstone

Hi,
I meet this problem that a pptp client dial up to PPTP server opened mppe, msn can not login via this pptp connection.
But if closed the mppe, msn can login sucessfully.
Someone can help me?Thanks.

MPPE is Microsoft Point-to-Point Encryption, to set up VPN tunnels. If MPPE is running, you're connected to a VPN, which puts you on that network. That network has its own rules/proxy servers/etc., for which you'll have to configure your MSN client to use.

If you shut down MPPE, you're on the 'public' internet, which can connect directly. Either configure your MSN client to use your VPN network settings, or leave MPPE shut down when you want to get on MSN.

willstone · 08-27-2008, 11:44 PM

Quote:

Originally Posted by TB0ne

Either configure your MSN client to use your VPN network settings, or leave MPPE shut down when you want to get on MSN.

Thank you, TBOne.
But how to configure MSN client to pass VPN?

TB0ne · 09-01-2008, 09:00 PM

Quote:

Originally Posted by willstone

Thank you, TBOne.
But how to configure MSN client to pass VPN?

You will have to answer that yourself. I don't know anything about your VPN or private network proxy setup.

willstone · 09-02-2008, 09:48 PM

Quote:

Originally Posted by TB0ne

You will have to answer that yourself. I don't know anything about your VPN or private network proxy setup.

But I have no any porxy settings;
I test this simple case:

Code:

			+---------- +
	PC  --------- 	|  Switch   | 	-----> internet
                     	+-----------+
				|
				|
			+----------- +
 			|A Router    |
			|(Embeded    |
			|PPTP Server)|
			+------------+  
				|
				|
			Local network

PC dial up to Router via PPTP client, so MSN login path will be :

PC --> Switch --> Router(WAN) --> Switch --> internet

Maybe MPPE do not support MSN naturally?

TB0ne · 09-03-2008, 09:26 AM

Quote:

Originally Posted by willstone

But I have no any porxy settings;

PC dial up to Router via PPTP client, so MSN login path will be :

PC --> Switch --> Router(WAN) --> Switch --> internet

Maybe MPPE do not support MSN naturally?

Re-read my original post. Once you fire up MPPE, you are connected to the VPN at your site. Your internet traffic is re-routed out your VPN connection...at that point, you are using the VPN to make your internet connection, that's why you need a proxy setting.

The fact that when you shut down MPPE your MSN works shows that.

willstone · 02-03-2009, 07:18 PM

It's the problem with MTU.
When enable MPPE, MTU will be decreased with 4 again, but windows client do not!
We can google a patch from internet for pppd with MPPE MTU.