Yes, there was an availability problem with our CRLs due to the CDN we use. Our monitoring reports it is available again.
Hi, thanks for the reply. This was my original post / feature request (I pressed Strg+Enter and it got posted):
Hi,
https://www.ssllabs.com/ shows for our domain.net:
Revocation status Validation error CRL ERROR: IO Exception occurred
PHP shows: OpenSSL Error messages:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed
https://r12.c.lencr.org/ is down with an http 500.https://www.isitdownrightnow.com/r12.c.lencr.org.html
Maybe add them to monitoring at https://letsencrypt.status.io/ or make them redundant.
The error was not showing in the monitoring, hence I wanted to let you know 
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