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caldav-Calendars reject valid let's encrypt certificates

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version 91 thunderbird-calendar, rejects my valid let's-encrypt certificates and I have to set an exception everytime they get updated (every 3month) (and potentially after an thunderbird update)

OS Win10

I have 8 different Calendars active, but they are all located on the same server (so same Base-URL) like https://myserver.com/..../calender1 up to calender8

other potentially special situation: that server has two valid certificates active (but only one IP4-address) ex: one cert for https://myserveruno.de/... and

      one for https://calservdtm.com/...


thanks in advance Thomas

version 91 thunderbird-calendar, rejects my valid let's-encrypt certificates and I have to set an exception everytime they get updated (every 3month) (and potentially after an thunderbird update) OS Win10 I have 8 different Calendars active, but they are all located on the same server (so same Base-URL) like https://myserver.com/..../calender1 up to calender8 other potentially special situation: that server has two valid certificates active (but only one IP4-address) ex: one cert for https://myserveruno.de/... and one for https://calservdtm.com/... thanks in advance Thomas

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remark: the URLs are just quick examples, I will certainly not post any real ones...

since I cannot edit my question: I made the mistake to use _3_ different URL-examples in my question, in reality there are only two different, as I mentioned. So replace "myserveruno.de" with "myserver.com", in the last example.

thx Thomas

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remark2: same problem occurs on current MacOS (problem started end of 2021)

on Windows10 i am using Thunderbird-Portable 91, on MacOS there are no Portable-Versions, I guess

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