Can't connect to server

Everything was working fine until last week it just stopped working, it won't let me log in. This is what I get

[xxxxxxxxx] SmartFTP v2.5.1008.27
[xxxxxxxxx] Resolving host name ""
[xxxxxxxxx] Connecting to Port: 21
[xxxxxxxxx] A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
[xxxxxxxxx] Cannot login waiting to retry (30s)...
[xxxxxxxxx] Client closed the connection.
[xxxxxxxxx] Active Help:

I'm sure is not my firewall because is not blocking any ports or anything