I solved getting another IP address.
this starts with 79.xxx.xxx.xxx instead of 87.xxx.xxx.xxx that my ISP always assign to me on connect.
Fidel told me that no IPs are banned from his server, so any should work.
I wonder if it's because I connect from Italy...
Strange enough, but I'm glad I'm back online.
It works and I don't make any further question
Thanks everybody.
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5 minutes later update:
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After writing this i tried checking the forums of my league and the problem is back again, I talked too early :-(
Now I'm really close to desperate.