Let's Debug

Request to: id-rsa.pub/2600:9000:210b:8800:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:8800:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:8800:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:8800:7:a0a8:780:93a1
@4ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 2600:9000:210b:8800:7:a0a8:780:93a1
@281ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:3e00:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:3e00:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:3e00:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:3e00:7:a0a8:780:93a1
@5ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@6ms: Dialing 2600:9000:210b:3e00:7:a0a8:780:93a1
@23ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:ca00:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:ca00:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:ca00:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:ca00:7:a0a8:780:93a1
@4ms: Server response: HTTP 301 Moved Permanently
@4ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 2600:9000:210b:ca00:7:a0a8:780:93a1
@22ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:be00:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:be00:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:be00:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:be00:7:a0a8:780:93a1
@4ms: Server response: HTTP 301 Moved Permanently
@4ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 2600:9000:210b:be00:7:a0a8:780:93a1
@22ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:e600:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:e600:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:e600:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:e600:7:a0a8:780:93a1
@4ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 2600:9000:210b:e600:7:a0a8:780:93a1
@21ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:6e00:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:6e00:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:6e00:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:6e00:7:a0a8:780:93a1
@3ms: Server response: HTTP 301 Moved Permanently
@3ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@4ms: Dialing 2600:9000:210b:6e00:7:a0a8:780:93a1
@19ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:de00:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:de00:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:de00:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:de00:7:a0a8:780:93a1
@4ms: Server response: HTTP 301 Moved Permanently
@4ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@4ms: Dialing 2600:9000:210b:de00:7:a0a8:780:93a1
@20ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/2600:9000:210b:f800:7:a0a8:780:93a1, Result: [Address=2600:9000:210b:f800:7:a0a8:780:93a1,Address Type=IPv6,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 2600:9000:210b:f800:7:a0a8:780:93a1)
@0ms: Dialing 2600:9000:210b:f800:7:a0a8:780:93a1
@10ms: Server response: HTTP 301 Moved Permanently
@10ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@10ms: Dialing 2600:9000:210b:f800:7:a0a8:780:93a1
@39ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/54.230.163.85, Result: [Address=54.230.163.85,Address Type=IPv4,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 54.230.163.85)
@0ms: Dialing 54.230.163.85
@5ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 54.230.163.85
@20ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/54.230.163.19, Result: [Address=54.230.163.19,Address Type=IPv4,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 54.230.163.19)
@0ms: Dialing 54.230.163.19
@5ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 54.230.163.19
@21ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/54.230.163.99, Result: [Address=54.230.163.99,Address Type=IPv4,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 54.230.163.99)
@0ms: Dialing 54.230.163.99
@5ms: Server response: HTTP 301 Moved Permanently
@5ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@5ms: Dialing 54.230.163.99
@21ms: Server response: HTTP 404 Not Found

Request to: id-rsa.pub/54.230.163.28, Result: [Address=54.230.163.28,Address Type=IPv4,Server=AmazonS3,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404], Issue:
Trace:
@0ms: Making a request to http://id-rsa.pub/.well-known/acme-challenge/letsdebug-test (using initial IP 54.230.163.28)
@0ms: Dialing 54.230.163.28
@4ms: Server response: HTTP 301 Moved Permanently
@4ms: Received redirect to https://id-rsa.pub/.well-known/acme-challenge/letsdebug-test
@4ms: Dialing 54.230.163.28
@20ms: Server response: HTTP 404 Not Found

id-rsa.pub. 0 IN A 54.230.163.85
id-rsa.pub. 0 IN A 54.230.163.19
id-rsa.pub. 0 IN A 54.230.163.99
id-rsa.pub. 0 IN A 54.230.163.28
id-rsa.pub. 0 IN AAAA 2600:9000:210b:8800:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:3e00:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:ca00:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:be00:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:e600:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:6e00:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:de00:7:a0a8:780:93a1
id-rsa.pub. 0 IN AAAA 2600:9000:210b:f800:7:a0a8:780:93a1

acme: error code 400 "urn:ietf:params:acme:error:connection": 108.156.201.12: Fetching https://id-rsa.pub/.well-known/acme-challenge/BjTDAISQZf45dKw1aWnjOJwFjSjJKpHkZY9lBuyCEh0: Timeout during connect (likely firewall problem)

The TLD for id-rsa.pub is: pub

Operational