Certificate for update.filezilla-project.org has been broken for me sinse May 26th
|certificate https ssl tls
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Testing the URL: https://update.filezilla-project.org with online certificate checkers report errors. Missing intermediate certificate seems to be the problem. Chain ends at filezilla-project.org which is not a valid Root CA.
This problem has been reported with bug #11934 and rejected. I have tested this at multiple sites and https://update.filezilla-project.org always fails to load. Mostly tested with Chrome or Firefox on macOS.