Let's Debug

Test result for frenchdo.red5.org using http-01

Error
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
Debug
Requests made to the domain
Request to: frenchdo.red5.org/159.89.242.79, Result: [Address=159.89.242.79,Address Type=IPv4,Server=,HTTP Status=0], Issue: ANotWorking
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

Debug
A and AAAA records found for this domain
frenchdo.red5.org. 0 IN A 159.89.242.79
Challenge update failures for frenchdo.red5.org in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/76678578
acme: error code 400 "urn:ietf:params:acme:error:dns": DNS problem: SERVFAIL looking up A for frenchdo.red5.org - the domain's nameservers may be malfunctioning
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for frenchdo.red5.org is: org
Debug
1 Certificates contributing to rate limits for this domain

Serial: 282224563757426466939295639320064908130452
NotBefore: 2020-02-20 20:30:44 +0000 UTC
Names: [doqasm02.red5.org]

Debug
The current status.io status for Let's Encrypt
Operational

Submitted Feb 25 18:22:18 2020. Sat in queue for 1ms. Completed in 6s. Hide verbose information.