b2bmobilelab.com has an A (IPv4) record (103.199.208.102) 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 b2bmobilelab.com/103.199.208.102: Get "http://b2bmobilelab.com/.well-known/acme-challenge/letsdebug-test": context deadline exceeded
Trace:
@0ms: Making a request to http://b2bmobilelab.com/.well-known/acme-challenge/letsdebug-test (using initial IP 103.199.208.102)
@0ms: Dialing 103.199.208.102
@10000ms: Experienced error: context deadline exceeded
A test authorization for b2bmobilelab.com to the Let's Encrypt staging service has revealed issues that may prevent any certificate for this domain being issued.
103.199.208.102: Fetching http://b2bmobilelab.com/.well-known/acme-challenge/wBPvRO2FdwvkLVWz8_AxxCmo4hBLymgv_FX6oztMon8: Timeout during connect (likely firewall problem)