Logon Problems

Cannot access files on my host server, doing exactly the same as previous attempts but getting following log report:
[16:01:39] Continue to login attempt 3...
[16:01:39] Resolving host name "**.**.***.***"
[16:01:39] Connecting to **.**.***.*** Port: 21
[16:01:39] Connected to **.**.***.***.
[16:02:00] An established connection was aborted by the software in your host machine.
[16:02:00] Server closed connection
[16:02:00] Cannot login waiting to retry (30s)...
Any suggestions????