Well me and Quickplay once had an issue that we would connect and get
Connecting to server...
Server didnot respond. Retrying...
Connecting to server...
Server didnot respond. Retrying...
Connecting to server...
Server didnot respond. Retrying...
etc....
We both had it at the same time, for an entire day D:
But after a while (like 8hours for me) it suddenly started working for us both....
I think its some type of "bug" or issue with the server, which normally has to be waited out.
But as fox says check ur firewall, and if uve installed anynew programs recently check they dont effect samp. other than that wait a while and see if it sorts it self out.