Strange records in log about googuu.xyz

[Denis_Telyukh (Dionysius)]

Sometimes, when we have problem with certificates settings, there are some strange records in Caddy’s logs

{"level":"debug","ts":1632726243.2547314,"logger":"http.stdlib","msg":"http: TLS handshake error from 103.116.108.51:37880: no certificate available for 'bella83886386026307.googuu.xyz'"}
{"level":"debug","ts":1632726244.674802,"logger":"tls.handshake","msg":"no matching certificates and no custom selection logic","identifier":"bella83886386026307.googuu.xyz"}
{"level":"debug","ts":1632726244.6748273,"logger":"tls.handshake","msg":"no matching certificates and no custom selection logic","identifier":"*.googuu.xyz"}
{"level":"debug","ts":1632726244.6748314,"logger":"tls.handshake","msg":"no matching certificates and no custom selection logic","identifier":"*.*.xyz"}
{"level":"debug","ts":1632726244.6748352,"logger":"tls.handshake","msg":"no matching certificates and no custom selection logic","identifier":"*.*.*"}
{"level":"debug","ts":1632726244.6748414,"logger":"tls.handshake","msg":"no certificate matching TLS ClientHello","server_name":"bella83886386026307.googuu.xyz","remote":"103.116.108.51:33203","identifier":"bella83886386026307.googuu.xyz","cipher_suites":[4865,4866,4867,49195,49196,52393,49199,49200,52392,49161,49162,49171,49172,156,157,47,53],"cache_size":26,"cache_capacity":10000,"load_if_necessary":true,"obtain_if_necessary":true,"on_demand":false}

What may it means?

[francislavoie]

That just means some bot may have tried to make a request to your server, but Caddy rejected the request because it does not have a certificate matching the domain it had in the request. These are harmless debug messages. You can ignore it.

[Denis_Telyukh (Dionysius)]

Thank you!