Wing FTP Software

I have a problem with my domain logs :
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[02] Sun, 22 Jan 2023 23:19:20 (0000041) Connected from 195.144.21.56 (local address *, port *)
[04] Sun, 22 Jan 2023 23:19:20 (0000041) 220 Wing FTP Server ready...
[03] Sun, 22 Jan 2023 23:19:20 (0000041) �
[04] Sun, 22 Jan 2023 23:19:20 (0000041) 500 Unknown command.
[03] Sun, 22 Jan 2023 23:19:20 (0000041) �A�����-�k�
[04] Sun, 22 Jan 2023 23:19:20 (0000041) 500 Unknown command.
[03] Sun, 22 Jan 2023 23:19:20 (0000041) ��̨�������������̩���/-�� [04] Sun, 22 Jan 2023 23:19:20 (0000041) 500 Unknown command.
[03] Sun, 22 Jan 2023 23:19:20 (0000041) �.,���
[04] Sun, 22 Jan 2023 23:19:20 (0000041) 500 Unknown command.
[04] Sun, 22 Jan 2023 23:19:20 (0000041) 500 Unknown command.
[04] Sun, 22 Jan 2023 23:19:20 (0000041) 500 Unknown command.
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This has happened 54 times.
Some access from unknown IP addresses causes garbled logs to appear.
how to solve this problem and make the logs correct.

Because the message sent from the FTP client is not UTF-8 encoding, maybe it used other encoding like GBK, so the domain logs are garbled, but it is not a big issue, just let your clients use popular FTP client software.