Let's Debug

Test result for b24.vplab.ru using http-01

b24.vplab.ru has an AAAA (IPv6) record (2a03:6f01:1:7f99::2) 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.
Get "http://b24.vplab.ru/.well-known/acme-challenge/letsdebug-test": dial tcp [2a03:6f01:1:7f99::2]:80: connect: no route to host

Trace:
@0ms: Making a request to http://b24.vplab.ru/.well-known/acme-challenge/letsdebug-test (using initial IP 2a03:6f01:1:7f99::2)
@0ms: Dialing 2a03:6f01:1:7f99::2
@2120ms: Experienced error: dial tcp [2a03:6f01:1:7f99::2]:80: connect: no route to host
A test authorization for b24.vplab.ru to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
94.228.127.153: Fetching https://b24.vplab.ru/.well-known/acme-challenge/K4hmKWqqyk2K35bVCwID4KYaVprTk1pp2Mae20Y-bpg: Error getting validation data
Debug
Requests made to the domain
Request to: b24.vplab.ru/2a03:6f01:1:7f99::2, Result: [Address=2a03:6f01:1:7f99::2,Address Type=IPv6,Server=,HTTP Status=0], Issue: AAAANotWorking
Trace:
@0ms: Making a request to http://b24.vplab.ru/.well-known/acme-challenge/letsdebug-test (using initial IP 2a03:6f01:1:7f99::2)
@0ms: Dialing 2a03:6f01:1:7f99::2
@2120ms: Experienced error: dial tcp [2a03:6f01:1:7f99::2]:80: connect: no route to host

Request to: b24.vplab.ru/94.228.127.153, Result: [Address=94.228.127.153,Address Type=IPv4,Server=nginx,HTTP Status=301,Number of Redirects=1,Final HTTP Status=401], Issue:
Trace:
@0ms: Making a request to http://b24.vplab.ru/.well-known/acme-challenge/letsdebug-test (using initial IP 94.228.127.153)
@0ms: Dialing 94.228.127.153
@202ms: Server response: HTTP 301 Moved Permanently
@203ms: Received redirect to https://b24.vplab.ru/.well-known/acme-challenge/letsdebug-test
@203ms: Dialing 94.228.127.153
@539ms: Server response: HTTP 401 Unauthorized

Debug
A and AAAA records found for this domain
b24.vplab.ru. 0 IN A 94.228.127.153
b24.vplab.ru. 0 IN AAAA 2a03:6f01:1:7f99::2
Challenge update failures for b24.vplab.ru in order https://acme-staging-v02.api.letsencrypt.org/acme/order/5751349/6805976883
acme: error code 400 "urn:ietf:params:acme:error:connection": 94.228.127.153: Fetching https://b24.vplab.ru/.well-known/acme-challenge/K4hmKWqqyk2K35bVCwID4KYaVprTk1pp2Mae20Y-bpg: Error getting validation data
Debug
The IANA public suffix is the TLD of the Registered Domain
The TLD for b24.vplab.ru is: ru
Debug
The current status.io status for Let's Encrypt
Operational

Submitted Jan 26 16:58:25 2023. Sat in queue for 1ms. Completed in 17s. Hide verbose information.