mysql_error 파일내용.

2022-02-09 13:57:48 4681 [Warning] Host name 'cust-147.keff.org' could not be resolved: 알려진 호스트가 없습니다. 
2022-02-09 13:57:51 4681 [Warning] Aborted connection 4681 to db: 'unconnected' user: 'unauthenticated' host: '45.154.255.147' (Got an error reading communication packets)
2022-02-09 13:57:51 4681 [Warning] Aborted connection 4681 to db: 'unconnected' user: 'unauthenticated' host: '45.154.255.147' (This connection closed normally without authentication)
2022-02-09 13:58:04 4682 [Warning] IP address '23.129.64.217' could not be resolved: 알려진 호스트가 없습니다. 
2022-02-09 13:58:04 4682 [Warning] Aborted connection 4682 to db: 'unconnected' user: 'unauthenticated' host: '23.129.64.217' (Got an error reading communication packets)
2022-02-09 13:58:04 4682 [Warning] Aborted connection 4682 to db: 'unconnected' user: 'unauthenticated' host: '23.129.64.217' (This connection closed normally without authentication)

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제가 봐도 감이 안와서요...혹시 저게 어떤 내용인지 아시는분 계실까요?