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

[Jan van Rensburg <jan.van.rensburg@xxxxxxxxxx>]

Hi,

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).

Thanks,
Jan

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

> Hi,
>
> 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?
>
> Thanks,
> Jan


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