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I set up a VPN on my server, everything seems okay but when I connect to it from Mac (didn't try windows) I can connect, I can send data and from the server I see that it receives it but it does not send any data back...

Did you ever happened to see this? Thanks a lot!

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Not even close to enough info to answer: is there a firewall, are the ports open on the firewall, can you connect from behind the fw, any event log errors on the server, does it work from a PC -if not what are the event log errors on the PC, what errors are logged on the Mac, how are you checking/seeing the "receive but no send" -Wireshark?, etc. – Ed Fries Feb 26 '10 at 7:26
I know this is not an answer and you'll better solve your problem... But if you happen to be in a dead end I've solved the vpn problem in a couple of clicks using Zeroshell: simply great. – Pitto Jun 8 '11 at 11:28

Its hard to say for certain due to the lack of details in the question but it sounds like a routing problem to me.

If you're VPN subnet is different than your LAN subnet you'll need to add a route on your LAN's default gateway that sends traffic for the VPN subnet to the VPN server so that the traffic can properly be routed back.

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