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Probably your firewall regexes “rape”

That was an amazing read.

So I guess even https://analytics.google.com/ would be a problem there

There's a link to submit a review on that page.

Thank you very much, I'm submitting right now

I really have no idea... The cert is issued by Let's Encrypt and so far it works pretty well (but maybe that might be an issue for that firewall)

Your domain name might just be triggering a word blocklist.

Better change the name now then rather than later. Such a shame that firewalls would do that though.