Multiple connections through VPN?  Error 721

Posted on 2009-02-18
Last Modified: 2012-05-06
Hi there.  I'm having trouble with getting multiple users to connect to a remote server via VPN at the same time.

I have a remote Windows Server 2003 SBS system with a PPTP VPN setup.  I have 4 users in the an office behind the same router that need to access the server.

What's happening is that I can get one machine to connect with no problems at all.  Anyone else is getting "Error 721 - Remote computer is not responding."  If I disconnect the first computer, I still can't login with any of the others, but I can relogin with the first with no trouble.

If I reset the router on our side, which is an Actiontec GT701-WG, I can then login using one of the other machines, but again, I can't login with any of the remaining three.  Even the one that was working last time.

What's odd is that when I set this up two days ago, I'm sure I had at least 2 or 3 of the machines running at the same time.  I certainly wasn't rebooting the router between machines.

In digging around and on this site, I saw some indication that you can't create multiple PPTP connections if you have only one public IP on each side.  Is this so?  Is that my problem?  If it is, how come it was working two days ago?  How can I resolve this?

I'll be keeping a close eye on this topic tonight so hopefully some people smarter than I am are up late and bored.

Thanks for your help.

Question by:ramon77
    LVL 6

    Expert Comment

    Have you checked your firewall rules? Make sure that your firewall allows connections on TCP port 1723 and IP Protocol 47 (GRE). Make sure that those ports are properly forwarded to you VPN Server.

    Are you users domain members? Do they use ther domain accounts to login? Check their account properties... Are they allowed to connect remotely?

    Accepted Solution

    KOTiS, thanks for your thoughts.  The firewall rules are fine and the users all have the appropriate permissions.  Any one of them can login to the VPN, just one at a time.

    We've decided on a completely different approach.  We're going to try LogMeIn's Hamachi.  This office is closing down in a few months anyway and most of the staff will be working out of their homes.  Hamachi should make it easy to keep them all connected without the need to configure any more routers or firewalls.

    I'd still love to hear ideas and fixes from anyone willing to share.

    Thank you.


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