I cannot join any Multiplayer games on OpenTTD I will give you a quick run through on what happens
1) The Map takes an extraordinary long time to download at most downloading at an estimated 3kb a second...
2) While going through this slow download process I occasionally get error messages saying "Possible connection lost, the last 8 seconds no data has arrived from the server" but then 10-20 seconds later this error messge goes away and the download carry on at an average of 4kb per second
3) At the end of the download I then get booted out of the server lobby and sent back to the main menu where I get an error message which says "Network-Game Connection lost"
I have Un-installed the game and re-installed it twice now, I have also booted the game as Admin but it keeps happening....

My best guess is that it has something to do with my Firewall and I need to allow the program permission to pass through my network to connect to the server so I can play.
If anyone has had this problem and has a fix please respond ASAP !
I appreciate a response from anyon.