Hamachi (
www.hamachi.cc) is basically a piece of software which allows you to have a LAN connection over the internet (there is a free version), this can be particularly useful in setting up and playing online games in Football Manager if you experience problems using the standard method of connecting over the internet.
I won't make an extensive guide because everything is quite self-explanatory.
You just need to download and install Hamachi, choose a username, create a Hamachi server server, get the people who are going to join the game to connect to this Hamachi server, create a game on FM with the "Run as server" box ticked, get the people who will join to see if the game appears in FM on the "Local Servers" part on the Network screen and if it doesn't, you just need to right-click on the host's username in Hamachi and then click "copy address" and then enter this in the "Join Other Server" box on FM.
I was not able to use the normal method of connecting, probably because of my router, but using Hamachi enables me to play online I hope this helps some of you in the same way it helped me.