MacOS – VPN send but not receive data

You're looking for static routes and the 'route' command. 'man route' from the shell for full info, but something like route -nv add -net 66.22.138 -interface tun0 (or whatever your VPN interface is) should route traffic bound for hulu.com over the VPN.

You'll probably want to establish a default gateway so that you are assured of routing your traffic correctly.

route add default 192.168.1.1 would add a static route for your router. Replace 192.168.1.1 with the actual IP address.

Note that these settings will not survive a reboot. If they work for you, you'll want to put them in a launch agent file.

I removed the file

/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist

and after a reboot the error

The server encountered an error processing registration. Please try again later.

was gone (Mac OS X creates a new 'NetworkInterfaces.plist' file during the boot process).

The file

/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist

contains informations about the network interfaces, it looks like the upgrade from 10.7 to 10.8 broke something (at least on my system).

'imagent' itself has no debug option but you can try tools like

dtruss 

or the

Instruments.app

to monitor the program. Instruments.app is part of XCode and a GUI to dtruss.

Or you can monitor the network traffic between imagent and the server.