Can't connect to the router via SSH, but via IP(LAN and Internet) is OK

I use MobaXterm to Connect to my Router remotely, when I entered the password, it crashed back immediately, Here is the MobaXterm's screenshot:

But I can still use luci Page and the router is working normally(I'm using this network to ask this question), I have almost no relevant knowledge about this, hope someone can provide a solution

Never heard of this terminal emulator. Download putty and try with it just to verify that it works or not.

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it just crashed at once, nothing in the log file...

what crashed, router or putty ?

putty, log is like that

Verify that dropbear is running: Status - Processes.
Restart dropbear: System - Startup.
Verify dropbear settings: System - Administration - SSH Access (post a screenshot)
Verify firewall allows all in lan zone: Network - Firewall - LAN zone INPUT ACCEPT.

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Status-Processes :

System - Startup


Restart already

SSH Acesss (I use this way to login)

Firewall Settings

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I don't see anything wrong. I suppose you have tried to reboot it already.
Take a backup of your configuration, System-Backup/Flash Firmware and do a Reset to defaults. Router must be able to accept ssh now.

This is the only way left...