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I have the auth log with thousands of:

error: kex_exchange_identification: banner line contains invalid characters

I can't find which process is causing this. How can I troubleshoot it?

Using: Ubuntu 16.04 OpenSSH_8.2p1 Ubuntu-4ubuntu0.9, OpenSSL 1.1.1f 31 Mar 2020

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    This is probably caused by ssh. Check your /etc/ssh/sshd_config. Maybe also install and configure fail2ban to prevent SSH attacks.
    – Ace
    Oct 9 at 16:05

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