Let's Debug

Test result for www.covs.nl using http-01

www.covs.nl has an AAAA (IPv6) record (2a02:2308:0:82e:9fd5:fe0a:560a:62f8) but a test request to this address over port 80 did not succeed. Your web server must have at least one working IPv4 or IPv6 address. You should either ensure that validation requests to this domain succeed over IPv6, or remove its AAAA record.
A timeout was experienced while communicating with www.covs.nl/2a02:2308:0:82e:9fd5:fe0a:560a:62f8: Get "http://www.covs.nl/.well-known/acme-challenge/letsdebug-test": context deadline exceeded

Trace:
@0ms: Making a request to http://www.covs.nl/.well-known/acme-challenge/letsdebug-test (using initial IP 2a02:2308:0:82e:9fd5:fe0a:560a:62f8)
@0ms: Dialing 2a02:2308:0:82e:9fd5:fe0a:560a:62f8
@10001ms: Experienced error: context deadline exceeded
A test authorization for www.covs.nl to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching https://www.covs.nl/.well-known/acme-challenge/hEpKNQnHKwrIBayy5EnQiNBDgOPzuipLYOrfgpkoAYU: Timeout during connect (likely firewall problem)
Debug
CAA records control authorization for certificate authorities to issue certificates for a domain
covs.nl. 0 IN CAA 0 issue "letsencrypt.org"
Debug
Requests made to the domain
Request to: www.covs.nl/2a02:2308:0:82e:9fd5:fe0a:560a:62f8, Result: [Address=2a02:2308:0:82e:9fd5:fe0a:560a:62f8,Address Type=IPv6,Server=,HTTP Status=0], Issue: AAAANotWorking
Trace:
@0ms: Making a request to http://www.covs.nl/.well-known/acme-challenge/letsdebug-test (using initial IP 2a02:2308:0:82e:9fd5:fe0a:560a:62f8)
@0ms: Dialing 2a02:2308:0:82e:9fd5:fe0a:560a:62f8
@10001ms: Experienced error: context deadline exceeded

Request to: www.covs.nl/178.21.114.226, Result: [Address=178.21.114.226,Address Type=IPv4,Server=Apache/2,HTTP Status=302,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://www.covs.nl/.well-known/acme-challenge/letsdebug-test (using initial IP 178.21.114.226)
@0ms: Dialing 178.21.114.226
@161ms: Server response: HTTP 302 Found
@161ms: Received redirect to https://www.covs.nl/.well-known/acme-challenge/letsdebug-test
@161ms: Dialing 178.21.114.226
@661ms: Server response: HTTP 404 Not Found

Debug
A and AAAA records found for this domain
www.covs.nl. 0 IN A 178.21.114.226
www.covs.nl. 0 IN AAAA 2a02:2308:0:82e:9fd5:fe0a:560a:62f8
Challenge update failures for www.covs.nl in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/1105277778
acme: error code 400 "urn:ietf:params:acme:error:connection": Fetching https://www.covs.nl/.well-known/acme-challenge/hEpKNQnHKwrIBayy5EnQiNBDgOPzuipLYOrfgpkoAYU: Timeout during connect (likely firewall problem)
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for www.covs.nl is: nl
Debug
6 Certificates contributing to rate limits for this domain

Serial: 316296867022970821253617843662723916865673
NotBefore: 2021-11-23 06:49:25 +0000 UTC
Names: [s1.covs.nl]

Serial: 352595936038013978653308887814670103233325
NotBefore: 2021-11-21 20:04:51 +0000 UTC
Names: [s2.covs.nl]

Serial: 423230104943102765606612404483231996268476
NotBefore: 2021-11-21 19:28:45 +0000 UTC
Names: [s2.covs.nl]

Serial: 390959327692358327802695198870127623370542
NotBefore: 2021-11-21 16:50:01 +0000 UTC
Names: [s2.covs.nl]

Serial: 356438863107005252627300103309838483859437
NotBefore: 2021-11-21 16:38:42 +0000 UTC
Names: [s1.covs.nl]

Serial: 325900255970486536298168273236579444207854
NotBefore: 2021-11-19 22:12:11 +0000 UTC
Names: [blad.covs.nl]

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

Submitted Nov 24 19:22:53 2021. Sat in queue for 42ms. Completed in 25s. Hide verbose information.