openedx.univ-bejaia.dz has an A (IPv4) record (41.111.207.114) 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 openedx.univ-bejaia.dz/41.111.207.114: Get "http://openedx.univ-bejaia.dz/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://openedx.univ-bejaia.dz/.well-known/acme-challenge/letsdebug-test (using initial IP 41.111.207.114)
@0ms: Dialing 41.111.207.114
@10000ms: Experienced error: context deadline exceeded
A test authorization for openedx.univ-bejaia.dz to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
41.111.207.114: Fetching http://openedx.univ-bejaia.dz/.well-known/acme-challenge/GWqUFxuyNPWhB7nCM19RkfR0L7KNHMv1beI3QHPhjvo: Timeout during connect (likely firewall problem)