SecureCRT can connect to remote hosts, but xshell can not. [1]

Jul 23 07:12:57 [localhost] polkitd[789]: Unregistered Authentication Agent for unix-process:1920:1343875 (system bus name :1.79, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
Jul 23 07:27:40 [localhost] sshd[1939]: Invalid user python-KING from 192.168.1.100 port 61349
Jul 23 07:27:40 [localhost] sshd[1939]: input_userauth_request: invalid user python-KING [preauth]
Jul 23 07:27:40 [localhost] sshd[1939]: pam_unix(sshd:auth): check pass; user unknown
Jul 23 07:27:40 [localhost] sshd[1939]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100
Jul 23 07:27:42 [localhost] sshd[1939]: Failed password for invalid user python-KING from 192.168.1.100 port 61349 ssh2
Jul 23 07:27:59 [localhost] sshd[1939]: pam_unix(sshd:auth): check pass; user unknown
Jul 23 07:28:01 [localhost] sshd[1939]: Failed password for invalid user python-KING from 192.168.1.100 port 61349 ssh2
Jul 23 07:28:24 [localhost] sshd[1939]: pam_unix(sshd:auth): check pass; user unknown
Jul 23 07:28:26 [localhost] sshd[1939]: Failed password for invalid user python-KING from 192.168.1.100 port 61349 ssh2
Jul 23 07:28:35 [localhost] sshd[1939]: error: Received disconnect from 192.168.1.100 port 61349:0: [preauth]
Jul 23 07:28:35 [localhost] sshd[1939]: Disconnected from 192.168.1.100 port 61349 [preauth]
Jul 23 07:28:35 [localhost] sshd[1939]: PAM 2 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100
Jul 23 07:28:38 [localhost] unix_chkpwd[1943]: password check failed for user (root)
Jul 23 07:28:38 [localhost] sshd[1941]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100 user=root
Jul 23 07:28:38 [localhost] sshd[1941]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Jul 23 07:28:40 [localhost] sshd[1941]: Failed password for root from 192.168.1.100 port 61486 ssh2
Jul 23 07:28:55 [localhost] unix_chkpwd[1944]: password check failed for user (root)
Jul 23 07:28:55 [localhost] sshd[1941]: pam_succeed_if(sshd:auth): requirement "uid >= 1000" not met by user "root"
Jul 23 07:28:57 [localhost] sshd[1941]: Failed password for root from 192.168.1.100 port 61486 ssh2
Jul 23 07:28:59 [localhost] sshd[1941]: error: Received disconnect from 192.168.1.100 port 61486:0: [preauth]
Jul 23 07:28:59 [localhost] sshd[1941]: Disconnected from 192.168.1.100 port 61486 [preauth]
Jul 23 07:28:59 [localhost] sshd[1941]: PAM 1 more authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=192.168.1.100 user=root

Program Ver. : Xshell 6

According to the message, the ssh connection was not allowed for unknown user python-KING and for root.

Root users are usually not allowed by default.

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