depending on server, mirc reports
SSL unexpected eof while reading
seems to be swallowing the cause and reporting the only ssl failure, which gives zero information, e.g.:
[24/01 01:06] Closing link: (***@***) [G-Lined: Excessive Services login failures. Your ban expires at about ***]
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[24/01 01:06] * Disconnected
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[24/01 01:06] * Connect retry #1 irc.***.net (+6697)
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[24/01 01:06] * Unable to connect to server (SSL unexpected eof while reading)