www2.selectscience.net has an A (IPv4) record (20.0.2.131) 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 www2.selectscience.net/20.0.2.131: Get "http://www2.selectscience.net/.well-known/acme-challenge/letsdebug-test": dial tcp 20.0.2.131:80: i/o timeout
Trace:
@0ms: Making a request to http://www2.selectscience.net/.well-known/acme-challenge/letsdebug-test (using initial IP 20.0.2.131)
@0ms: Dialing 20.0.2.131
@10001ms: Experienced error: dial tcp 20.0.2.131:80: i/o timeout
A test authorization for www2.selectscience.net to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
20.0.2.131: Fetching http://www2.selectscience.net/.well-known/acme-challenge/YWJQHwwuSRls7DK2joWIwrnGXQJ37ZwFBiTzEw0t5k8: Timeout during connect (likely firewall problem)