Mail, iCal Server and iChat server will not work over VPN
I have an Airport Extreme Base Station at the office running the network. Behind it sits a Mac Mini Snow Leopard server running 10.6.3. The ports necessary for Mail, iCal Server and iChat work fine through that external connection. I can also connect with VPN from my 10.6.3 clients.
HOWEVER, when I connect with the VPN clients, I am suddenly unable to access the Mail, iCal Server, Wiki server and iChat server. All connections time out. I can ping the server and I can do other things that do NOT work on the public Airport like ssh or VNC. ssh and VNC are closed at the airport extreme.
So it's pretty odd. When I'm connected via the VPN, all ports that are forwarded to the Snow Leopard server time out over the VPN.
I've tried various and sundry configurations with the VPN client. This includes trying to send all traffic over the VPN, moving it up in the service order, etc. etc. Nothing fixes it. DNS resolution is working fine, however when I do a wireshark capture of ppp0 traffic, I notice that SSL and TLSv1 handshakes appear to occur on the public IP address instead of the private network IP address... and they're all resets.
Has anyone gotten this to work successfully? Like I said, all ports that are NOT forwarded through the Airport work fine over the VPN, but will not work when connected to the VPN. It's really bizarre.
New data: any ports that are normally forwarded on the Airport Extreme to the Mac Mini server will not work when connected to the VPN.
For instance, if I have imaps/993 forwarded from the Airport Extreme to the Mac Mini, it works fine over the Internet. If I connect to the VPN, I can connect to all OTHER services on the Mac Mini, but Mail, for instance, will not work.
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