Getting error: [SSL: TLSV1_ALERT_DECODE_ERROR] tlsv1 alert decode error (_ssl.c:581)

[vakuznet]

My client supports TLS up to 1.2. imc server is TLSv1

I think that

ssl.wrap_socket = partial(ssl.wrap_socket, ssl_version=ssl.PROTOCOL_TLSv1)

does not do the job at all. (ImcHandle.py:188)

Client still uses default context with PROTOCOL_SSLv23.

Also better way to handle failed handshake is to try PROTOCOL_SSLv23 first then drop to PROTOCOL_TLSv1_1 and PROTOCOL_TLSv1.