RaspberryPi SSH Error occur once again

Situation

After using terminus(mobile app) or something, I can’t connect to my raspi4.

Trial

1. I think I also use ufw of my raspi4. Maybe because of firewall, it can be diconnected.
   

2. After fixing SSH connection of Putty, VSC is not working. So, I erase ~.ssh directory files only left config file. And I regen of public key by Puttygen.
   

Result

It works well. But I don’t know exactly what’s cause and solution.
After getting more experience, I will find them.

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