AttributeError: 'NoneType' object has no attribute 'ssl_cert' on session start about xpra HOT 4 CLOSED

If you're connecting to the proxy server, then unless you have changed the configuration, authentication is going to be needed - but this cannot be done safely over TCP, so the client is attempting to upgrade to SSL.
Unfortunately, the SSL certificate is the default self-signed one, so verification failed.
We should definitely handle this better.

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i see. is there a way to invoke xpra that accepts self-signed certs? this is an environment I trust not to be meddled with (if it is, i have considerably bigger problems than xpra).

i have since managed to make it work (it did not work before, but i don't know what i'm doing exactly so it was probably my fault) by doing xpra start --bind-tcp=0.0.0.0:10000 --start=xterm on the server and xpra attach tcp://... on the client.

closing as i have a workaround.

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To skip SSL certificate verification: --ssl-server-verify-mode=none.

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Looks like I forgot to backport: c819f21, see details in #3313

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