..it's OK here, and the certificate is reported as renewed at the start of September.
I wonder (given Zippy's comment on DNS servers) whether this is a throw-back to the migration and certificate work in January.
If the private DNS has not been updated or has been refreshed in error, and the old version of the forum is still reachable, then there would (I think) be certificate errors. It would only apply if that access hadn't been used since the change, or if the private DNS server had somehow had the address reverted.
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