Let's Debug

Test result for cdo-tst.lenovo.com using http-01

A test authorization for cdo-tst.lenovo.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
Fetching http://cdo-tst.lenovo.com/.well-known/acme-challenge/MwDoNmiCyronYIIF2idfyjn2HqWdpvaO_iSDpka8n_Y: Timeout during connect (likely firewall problem)

Submitted Nov 18 05:04:43 2019. Sat in queue for 1ms. Completed in 18s. Show verbose information.