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No results whatsoever, i'm not entirely sure what's going on i am currently trying to forward ports for it. It doesn't really seem to work

So I have been playing Arma 2 OA for a while happily then one morning as I logged on to play multiplayer no servers where displayed, I checked my filters and they are all reasonable and should display them, however they don't. Arma 2 works fine it is only OA that is the problem. Any ideas? Sorry if this is a copy of a similar post, I searched for ages and didn't find the same problem. Any help will be appreciated. :D