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[Openvpn-users] Re: Multiple Connections problem, bug

  • Subject: [Openvpn-users] Re: Multiple Connections problem, bug
  • From: Jan van Rensburg <jan.van.rensburg@xxxxxxxxxx>
  • Date: Tue, 1 Mar 2005 20:27:41 +0200


I've reported this problem just over a month ago. When using Mac OS X as the OpenVPN client, and trying to establish multiple connections to the same machine and port behind the OpenVPN server, some of the connections get dropped silently, causing erratic behaviour. I've done some troubleshooting and can report that this is a bug in either the Mac version of OpenVPN, or in the tun driver on Mac OS X.

I've set up a Linux machine between the Mac OS X machine and the OpenVPN server. I loaded OpenVPN onto the Linux machine, and used the exact same OpenVPN client config file and keys as I previously did on Mac OS. Then I configured the the Linux machine to NAT connections from my Mac, and used it as my Mac's default gateway. The problem suddenly went away!

Naturally, as a Mac user I'd like to see this fixed, so once we've settled on a PayPal alternative I'll gladly chip in to get a Mac for the relevant developers. (PayPal doesn't accept accounts from South Africa).


On 24 Jan 2005, at 12:11 PM, Jan van Rensburg wrote:


I'm using the latest v2.rc6, Linux (SLES9) and iptables on the server side, Mac OS 10.3 client side. The general connections work pretty well, but I have trouble opening multiple connections to the same destination address & port to a machine behind the VPN.

The mail application on Mac OS X is heavily threaded and establishes multiple connections to the mail server in parallel, because I've got two accounts on the mail server, and it also establishes parallel connections for downloading attachments and so on. When I connect through the OpenVPN tunnel some of these connections never gets established, but the "main" connection works fine. I have this problem over both UDP and TCP tunnels. When close the tunnel and connect directly to the mail server the problem disappears again. Is this a known problem, and how can I go about troubleshooting it?


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