Welcome Maxim,
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I don’t think you need to open special ports. Do you have the scm-trace-monitor-plugin installed? There you should see your request and maybe also why it is failing. Besides you could try to check your server logs for some meaningful stacktraces.
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Yes, it is possible to download the “Cloudogu” plugins manually. But we strongly suggest that we help you to fix your connection so updates and new plugin are immediately available for you.
Example for manual installation: Custom-Footer-Links
Regards, Eduard