www.jonrowlison.com has an A (IPv4) record (66.41.220.137) 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 www.jonrowlison.com/66.41.220.137: Get "http://www.jonrowlison.com/.well-known/acme-challenge/letsdebug-test": dial tcp 66.41.220.137:80: i/o timeout
Trace:
@0ms: Making a request to http://www.jonrowlison.com/.well-known/acme-challenge/letsdebug-test (using initial IP 66.41.220.137)
@0ms: Dialing 66.41.220.137
@10000ms: Experienced error: dial tcp 66.41.220.137:80: i/o timeout
A test authorization for www.jonrowlison.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
66.41.220.137: Fetching http://www.jonrowlison.com/.well-known/acme-challenge/67AVY9x5uOgbJquMpmxrPr1aJZzM3MEBnlC_Qar7y_A: Timeout during connect (likely firewall problem)