Mattermost (5.35.1) on Debian | image proxy problem

If your links don’t show proper images check the following:

  • System console: Allow public links
  • System console: Image proxy on and set to local

vim /opt/mattermost/config/config.json >>
"AllowUntrustedInternalConnections":"localhost mattermost.mydomain.mytld"

System console: SiteURL >> Set no port or :443 at the end, do it like




Avoid default port 8065 like


The test button will fail for unknown reasons, don’t worry and go along.

Test your stuff, post something like


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