I have problem with connection

I have a problem with the server. It says: The server didn't respond.Retrying... I was banned from the server, they unbanned me, but I can't connect to the server.

Hmm check what version of samp your playing on, we are currently in 0.3d, if your in 0.3e then you will have to install 0.3d again im afraid

If that's not the problem then i don't know, good luck

I install the version 0.3d again and again but the problems remai. Maybe i'm not unbanned.

No your unbanned, try using a different name.
If already tried this then add me on skype if you have it then we can talk.