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/OMOtRN0f6Zth8_KXthpEKmeqqvtjBAUH_Q-dcn1HmgU: Timeout during connect (likely firewall problem)