Hello, I have problem with sshd server, its authenticate user and then terminate the session. Here is debug log

Jan 1 04:26:41 server sshd[29677]: debug1: userauth-request for user root service ssh-connection method none
Jan 1 04:26:41 server sshd[29677]: debug1: attempt 0 failures 0
Jan 1 04:26:43 server sshd[29677]: debug1: userauth-request for user root service ssh-connection method password
Jan 1 04:26:43 server sshd[29677]: debug1: attempt 1 failures 0
Jan 1 04:26:43 server sshd[29676]: Accepted password for root from xx.xx.xx.xxx port 50971 ssh2
Jan 1 04:26:43 server sshd[29676]: debug1: monitor_child_preauth: root has been authenticated by privileged process
Jan 1 04:26:43 server sshd[29676]: debug1: temporarily_use_uid: 0/0 (e=0/0)
Jan 1 04:26:43 server sshd[29676]: debug1: ssh_gssapi_storecreds: Not a GSSAPI mechanism
Jan 1 04:26:43 server sshd[29676]: debug1: restore_uid: 0/0
Jan 1 04:26:43 server sshd[29676]: debug1: SELinux support disabled
Jan 1 04:26:43 server sshd[29676]: debug1: Entering interactive session for SSH2.
Jan 1 04:26:43 server sshd[29676]: debug1: server_init_dispatch_20
Jan 1 04:26:43 server sshd[29676]: debug1: server_input_channel_open: ctype session rchan 256 win 16384 max 16384
Jan 1 04:26:43 server sshd[29676]: debug1: input_session_request
Jan 1 04:26:43 server sshd[29676]: debug1: channel 0: new [server-session]
Jan 1 04:26:43 server sshd[29676]: debug1: session_new: session 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_open: channel 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_open: session 0: link with channel 0
Jan 1 04:26:43 server sshd[29676]: debug1: server_input_channel_open: confirm session
Jan 1 04:26:43 server sshd[29676]: debug1: server_input_channel_req: channel 0 request pty-req reply 1
Jan 1 04:26:43 server sshd[29676]: debug1: session_by_channel: session 0 channel 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_input_channel_req: session 0 req pty-req
Jan 1 04:26:43 server sshd[29676]: debug1: Allocating pty.
Jan 1 04:26:43 server sshd[29676]: debug1: session_pty_req: session 0 alloc /dev/pts/0
Jan 1 04:26:43 server sshd[29676]: debug1: server_input_channel_req: channel 0 request shell reply 1
Jan 1 04:26:43 server sshd[29676]: debug1: session_by_channel: session 0 channel 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_input_channel_req: session 0 req shell
Jan 1 04:26:43 server sshd[29678]: debug1: Setting controlling tty using TIOCSCTTY.
Jan 1 04:26:43 server sshd[29678]: debug1: permanently_set_uid: 0/0
Jan 1 04:26:43 server sshd[29676]: debug1: Received SIGCHLD.
Jan 1 04:26:43 server sshd[29676]: debug1: session_by_pid: pid 29678
Jan 1 04:26:43 server sshd[29676]: debug1: session_exit_message: session 0 channel 0 pid 29678
Jan 1 04:26:43 server sshd[29676]: debug1: session_exit_message: release channel 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_pty_cleanup: session 0 release /dev/pts/0
Jan 1 04:26:43 server sshd[29676]: debug1: session_by_channel: session 0 channel 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_close_by_channel: channel 0 child 0
Jan 1 04:26:43 server sshd[29676]: debug1: session_close: session 0 pid 0
Jan 1 04:26:43 server sshd[29676]: debug1: channel 0: free: server-session, nchannels 1
Jan 1 04:26:43 server sshd[29676]: Connection closed by xx.xx.xx.xxx
Jan 1 04:26:43 server sshd[29676]: debug1: do_cleanup
Jan 1 04:26:43 server sshd[29676]: Transferred: sent 2792, received 1688 bytes
Jan 1 04:26:43 server sshd[29676]: Closing connection to xx.xx.xx.xxx port 50971

What can be the problem? Thank You

do you allow remote root logins even if it's a big big big big mistake to do.

Yes, I allowed root login