No SSL certificate being successfully served

Hi,
suddenly https://glauserpartner.ch and https://www.glauserpartner.ch stopped working. Only http://glauserpartner.ch does work.
It’s hosted on CloudCannon and they asked me to get help here, since the SSL Checker shows an error: “No SSL certificates were found on www.glauserpartner.ch. Make sure that the name resolves to the correct server and that the SSL port (default is 443) is open on your server’s firewall.”
I’ve double checked my settings in CloudFlare and everything seems right. My SSL encryption is set to “Flexible”, “Disable Universal SSL” is unchecked.

Thanks for helping out!

So I updated to a “Dedicated SSL” in CloudFlare and it seems to work again. This is weird though, should work on the free plan as well (as it did for the last couple of years…)?

+1, yes. The only thing odd I can see is the domain shows as moved away from cloudflare for a few hours about a week ago, I don’t know if that reset ssl. Will also look around for similar reports.

https://www.cloudflare.com/ips-v4

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