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marcus65
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Location: Brooklyn, New York

pptp vpn client cannot connect

Sat Apr 05, 2014 10:52 pm

I cannot get a pptp vpn client (laptop) to connect to a RB 2011UAS-2nD running RouterOS v6.0rc14

The pptp server is working and I can connect when any client is on the LAN. I cannot connect to the router from any remote location. I winbox into the router from the WAN and watch the connection start to bind to the pptp server. The connection appears as an interface in both PPP and router interface window.
Image

Connections appear (port 1723 & GRE) in the firewall connections window. And the connection times out and gives me an error 806 in MSWindows that an internet device is not allowing GRE.

I have tried:
- Opening the firewall to accept port 1723, gre, 1701 (l2tp) on the input chain and gre on output as well (only accepting 1723 on input seems necessary).

5 ;;; Allow pptp vpn
chain=input action=accept protocol=tcp dst-address=11.22.33.44 dst-port=1723
6 X chain=input action=accept connection-state=new protocol=gre dst-address=11.22.33.44
7 X chain=output action=accept protocol=gre src-address=0.0.0.0/0

- Using ip firewall nat (to no avail)
- Connecting with and without encryption
- Connecting from 3 different WAN locations.
- Using different local and remote address configs (they all work locally and not remote)
- Creating a static pptp server binding with the dial-in user.

The only clue I have is that when I login on the LAN the server binding picks up the “secrets” [user login] name while the remote binding name is pptp-0 before it times out.

Image

How can I trouble shoot this?
Is there a way to check the quality of the gre connection to see if or why it's not working?
Is this a firewall issue?
Is this an ISP issue?
Is this a RouterOS bug?
 
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Re: pptp vpn client cannot connect

Sun Apr 06, 2014 1:17 am

v6.0rc14????


UPDATE TO 6.7+, THIS VERSION IS UNSUPPORTED.
 
marcus65
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Posts: 26
Joined: Fri Feb 08, 2013 4:15 am
Location: Brooklyn, New York

Re: pptp vpn client cannot connect

Mon Apr 07, 2014 12:41 am

Thanks for the suggestion,
I upgraded to v6.11 which is the most recent ROS version for the RB 2011. 6.7+ is not available for this model on the MikroTik web site.

The Problem persists! I cannot connect remotely!

I see GRE and TCP port 1723 connections before the VPN connection fails. But I get error messages from MSWindows indicating possible GRE problems. I'm looking for troubleshooting suggestion from the forum. Does anyone have an idea how to troubleshoot this???

I'll contact my ISP but don't see why they would block GRE
 
michael79
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Location: Germany / Stuttgart

Re: pptp vpn client cannot connect

Sat Apr 12, 2014 2:30 am

Please post a screenshot of settings the firewall and the NAT settings of your router.
You may be there, the error buried.
 
Urajmal
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Re: pptp vpn client cannot connect

Wed Jan 27, 2021 10:13 am

Topci Author, did you find a solution?
 
erlinden
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Re: pptp vpn client cannot connect

Wed Jan 27, 2021 10:18 am

Topci Author, did you find a solution?
In those nearly 7 years he probably did...
Hope you are not overthinking PPTP!?
 
Urajmal
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Re: pptp vpn client cannot connect

Wed Jan 27, 2021 10:31 am

Did find a solution. In most cases the Windows 10 firewall is somehow blocking the connections, if the connection on other devices works.

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