I am new to Arma 2 and most people suggest to use Six updater to add mods like ACE2. So far I have downloaded the CBA/ACE2 mod. My question is, is the mod compatible with all if not most servers?

1) When I join some servers it kicks me saying the ACE mod has invalid signatures or something and asks me to remove a bunch of files before joining again. Can I assume that these servers do not support the mod and I have to turn it off in order to join?

2) Is there any way to get the ping columon on the serverlist on sixupdater to work (atm the ping is 0 for all servers)? I live in Australia so finding the mods on some server in the US or europe isn't really beneficial to me.

3) How do I know what servers support what mods without sixupdater?

Cheers