Maybe start in looking the server logs ?
You should have more details in there.
Posts by Athar
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First, you should use the packaged version.
Compile those PHP version are more of a problem, really.
Then, for PHP5.6 :
Clear enought.
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fulltilt use the edit function, avoid to post multiple times in a row
(I did it for you this time) -
With the snapd solution, I'm fine (did the same as you, the chain1.pem to the same site, R3/ISRG1)
But, I just tried to add a new subdomain, then add the SSL with the LE plugin, and today, don't ask me why, not working
Maybe the DNS isn't yet fully replicated all over the world, so I'm waiting a little to try again.
Edit : I confirm, this was a DNS propagation issue (was a fresh new subdomain), just retried now (22:40) and it pass:
R3 by ISRG X1, so this is working.
I just got a little issue, the "cross-signed" certificate in CA-Certificate, I disabled those, wasn't able to use CURL with sites based on Let'sEncrypt SSL certs.
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Yes, if you rerun the UPDATE plugin, it replace the certbot with the old one package with it.
In this case, delete it and redo the symlink with the one from snapd, should be enough
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Well, read the general post which Kess posted ?
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Funny, didn't get any validation error (else the panel wouldn't enable the SSL for the specified domain).
Don't know what's wrong on your server, but something might be missing as it can't verify the certificate.
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I did remove a few certs during my tests, so I did create some fresh new certs for those, no issues.
Same for a domain which never get enrolled with LE, it worked (SSL is working for this site, so the VHost is created, else would not work at all
)