Why can't I connect via SSH using login + password?

Question

linux

After entering the password, the connection is reset. At the same time, if I enter the wrong password, the connection is NOT reset.

$ ssh -v [email protected]**.**.129
...
...
#ввожу неверный пароль
[email protected]**.**.129's password: 
debug1: Authentications that can continue: publickey,password,keyboard-interactive
Permission denied, please try again.
...
#ввожу верный пароль
[email protected]**.**.129's password:
debug1: Authentication succeeded (password).
Authenticated to 126.**.**.129 ([126.**.**.129]:22).
debug1: channel 0: new [client-session]
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug1: pledge: network
debug1: Sending environment.
debug1: Sending env LANG = ru_RU.UTF-8
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype [email protected] reply 0
debug1: channel 0: free: client-session, nchannels 1
Connection to 126.**.**.129 closed.
Transferred: sent 2800, received 1816 bytes, in 0.3 seconds
Bytes per second: sent 8296.2, received 5380.7
debug1: Exit status 1

Answer 1

ssh -l admin 126.**.**.129
?

Answer 2

Go to the server console and check the logs - depends on the distro, usually /var/log/auth or /var/log/secure.

Answer 3

I dare say the file system is full on the other side...