ssl.SSLError: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] ssl/tls alert handshake failure (_ssl.c:1000)

[jlczuk]

I'm trying to use zti to connect to a z/OS system's tn3270 port. When I do I get this error. I don't know how to resolve this. I was able to connect to a different z/OS system successfully.

Sorry about the lack of formatting in the following stack trace. The issue won't let me format it inside the code block.

Session: NONE> goto somesys.com:2023 Traceback (most recent call last): File "/x/.pyenv/versions/3.12.2/lib/python3.12/site-packages/tnz/tnz.py", line 3698, in __connect await loop.create_connection(protocol, host, port, File "/opt/homebrew/Cellar/python@3.12/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio base_events.py", line 1149, in create_connection transport, protocol = await self._create_connection_transport( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/opt/homebrew/Cellar/python@3.12/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/base_events.py", line 1182, in _create_connection_transport await waiter File "/opt/homebrew/Cellar/python@3.12/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/sslproto.py", line 578, in _on_handshake_complete raise handshake_exc File "/opt/homebrew/Cellar/python@3.12/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/asyncio/sslproto.py", line 560, in _do_handshake self._sslobj.do_handshake() File "/opt/homebrew/Cellar/python@3.12/3.12.3/Frameworks/Python.framework/Versions/3.12/lib/python3.12/ssl.py", line 917, in do_handshake self._sslobj.do_handshake() ssl.SSLError: [SSL: SSLV3_ALERT_HANDSHAKE_FAILURE] ssl/tls alert handshake failure (_ssl.c:1000) SESLOST = 'SOMESYS'

[najohnsn]

First thing to do is to check this out: https://ibm.github.io/tnz/security

[jlczuk]

That did the trick. Thank you!