Unable to connect non-TLS: `unable to verify the first certificate` about mongooseim-docker HOT 3 CLOSED

Thanks @silverbucket for reporting this. I apologise for replying with a huge delay, but honestly we are rarely checking the issues for this repo, because it is only a helper repository for MongooseIM.

Regarding the issue, MongooseIM actually has TLS enabled in the default configuration file, because the listen.c2s.tls section is present in /usr/lib/mongooseim/etc/mongooseim.toml. We might change the wording in the docs a bit. By default a fake certificate is used (intended only for testing), and you can disable it by commenting out (or removing) the tls options:

[[listen.c2s]]
  port = 5222
  access = "c2s"
  shaper = "c2s_shaper"
  max_stanza_size = 65536
  #tls.verify_mode = "none"
  #tls.certfile = "priv/ssl/fake_server.pem"

When I tested this with your JS script, I figured out that somehow the connection was dropped. This led me to discover a bug, which I fixed in esl/MongooseIM#4150.

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Related bugs are fixed now, and the docs are updated.

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@chrzaszcz thanks for following up on this! I'm glad it led to a bug being fixed, even if indirectly :) Also I had a look at the updated docs and it does read more clearly now. Cheers!

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