Renewal of certificate on nginx / Fedora 27 not working

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Hi,

This is not that much of a issue though....

This is a matter of TLS-SNI being depreciated...

One easy fix: sudo certbot renew --preferred-challenges http
It will convert all validations from TLS-SNI-01 (use port 443) to HTTP-01 (use port 80)

Thank you

P.S. Official depreciation announcement:

Some personal interpretation on this error (not the depreciation):