similarity.widebot.net has an A (IPv4) record (40.121.59.120) 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.
A timeout was experienced while communicating with similarity.widebot.net/40.121.59.120: Get "http://similarity.widebot.net/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://similarity.widebot.net/.well-known/acme-challenge/letsdebug-test (using initial IP 40.121.59.120)
@0ms: Dialing 40.121.59.120
@10001ms: Experienced error: context deadline exceeded
A test authorization for similarity.widebot.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
40.121.59.120: Fetching http://similarity.widebot.net/.well-known/acme-challenge/GIXgKwDHUL9oK2rWfzv1AAX-e4Ktq2k5_Xk8J3cklFY: Timeout during connect (likely firewall problem)