frenchdo.red5.org has an A (IPv4) record (159.89.242.79) but a request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address.
Get http://frenchdo.red5.org/.well-known/acme-challenge/letsdebug-test: dial tcp 159.89.242.79:80: connect: connection refused
Trace:
@0ms: Making a request to http://frenchdo.red5.org/.well-known/acme-challenge/letsdebug-test (using initial IP 159.89.242.79)
@0ms: Dialing 159.89.242.79
@2ms: Experienced error: dial tcp 159.89.242.79:80: connect: connection refused
A test authorization for frenchdo.red5.org to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
DNS problem: SERVFAIL looking up A for frenchdo.red5.org - the domain's nameservers may be malfunctioning