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Same problem here. The strange thing: it was working before the upgrade to Snow Leopard, i.e. we could connect via VPN and access services on the VPN gateway (we could also ping the server/VPN gateway). I could swear it was working before the update to 10.6.2 but I can’t be entirely sure about that.
The server/VPN gateway’s internal interface IP is 192.168.40.1. The external interface is a public IP address.
I’ve tried L2TP and PPTP connections and neither one can ping the server once connected. Interestingly enough, there is a VMWare Windows virtual machine running on the server/VPN gateway. The virtual machine has an IP address of 192.168.40.11. I can ping this server just fine and access services on it. I can ping and access everything on the subnet but the server/VPN gateway. BTW, I tried the VPN before installing VMware just to make sure VMWare wasn’t messing with the network interfaces, but still no luck.
In fairness, we can actually access services on the VPN gateway but it is super-slow. For example, if you try to pull up a webpage running on the web server, it takes a good 15-30 seconds to load. Connecting to AFP shares also works but it takes 15-30 seconds to get the authentication box to pop up. It’s like the packets aren’t routing correctly.
Pinging 192.168.40.1 does not work. DNS queries do not resolve either – even for DNS entries that are outside our network, e.g. our public website on MediaTemple and custom URLs for applications on Google (BTW, these never load when connected via VPN).
I even tried doing a clean install of SLS since the server had been upgraded from Tiger to Leopard to Snow Leopard, which I figured had left a lot of detritus along the way. At least everything else on the server is running well now!
Unfortunately, buying another server to act solely as a VPN is just not feasible for our small company. I wish we could get his working because the server hosts a critical business application with a MySQL backend and connecting through VPN makes working on that app painfully slow. Any other ideas on solving this would be most welcome. I’ve tried just about everything I can think of.
