depending on server, mirc reports
Quote
SSL wrong version number
Quote
SSL unexpected eof while reading

seems to be swallowing the cause and reporting the only ssl failure, which gives zero information, e.g.:

Quote
[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)