Error in log meaning

What does that mean?
error[01/01/2020 à 17:58:01] Error in ActivityPub signature checker.connect ENETUNREACH 2a01:e0a:c6:7930:2a0:98ff:fe6f:b414:443 - Local (:::0) { “errno”: “ENETUNREACH”, “code”: “ENETUNREACH”, “syscall”: “connect”, “address”: “2a01:e0a:c6:7930:2a0:98ff:fe6f:b414”, “port”: 443, “stack”: “Error: connect ENETUNREACH 2a01:e0a:c6:7930:2a0:98ff:fe6f:b414:443 - Local (:::0)\n at internalConnect (net.js:882:16)\n at defaultTriggerAsyncIdScope (internal/async_hooks.js:294:19)\n at GetAddrInfoReqWrap.emitLookup [as callback] (net.js:1029:9)\n at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:61:10)” }

It seems there’s an issue with IPv6 on your server. Try ping6 the above IP address.

All right. Actually IPv6 is not available on my Bouygues FTTH box :face_with_raised_eyebrow: