Airport Card on MacBook Pro unable to connect to VPN networks

For the last year or so (apart from two glorious months at the start of this year) when using an Airport connection, I'm unable to access any VPN networks. I always get an error saying that the VPN server is not responding.
However, if I use an ethernet connection, a USB Wifi modem or an iPhone tethering I can connect without any issues.
The VPN connections started working in January to my utter surprise. I think it may have been connected to the 10.6.6 update, but stopped working again when I did my last update on March 13th. I installed Java 10.6 update 4, iTunes 10.2.1 and Safari 5.0.4.
I'm about to install Mac OS X 10.6.7 to see if it has any effects but I wanted to know if this is a known issue and whether or not there are any solutions to the problem?
Message was edited by: Tinna
Seems like the 10.6.7 update solved the problem.

Hello Oliver,
I would start with removing your Wi-Fi network from your Preferred Network list. To do that, navigate to the Symptom: After restarting or waking from sleep, my computer might not connect to the Internet section in the first article and it will walk you through that. Another thing you can try is creating a new Network Location to see if there is an issue with your current configuration and the steps for that are in the second article.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/en-us/HT202222
Using network locations (Mac OS X v10.6 and later)
http://support.apple.com/en-us/HT202480
Regards,
-Norm G.

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