Sshd Problem: A protocol error occurred. Change of username or service not allowed

In the SECURECRT remote tool, when using Roto login, there is a

The server has a disconnected with an error. Server Message READS:A protocol error occurred. Change of username or service not allowed: (shang1,ssh-connection)-(shang,ssh-connection)

This is because the root account login is disabled in sshd.

To modify the sshd configuration file:

Vim/etc/ssh/sshd_config

Put Permitrootlogin No

Change to Permitrootlogin Yes

The root account allows you to log in remotely.

Or create a new account locally with the root account, such as

Useradd user1

passwd user1

Then give a sudo permission

Vim/etc/sudoers

Find root all= (all) all

Copy this line directly, modify root to User1, paste to the bottom of this line, all is unqualified permission.

User1 all= (All) all

Using User1 telnet, and sudo su-, enter the password to use root privileges.

This article is from the "Study" blog, make sure to keep this source http://wxpan.blog.51cto.com/4861826/1677103

Sshd Problem: A protocol error occurred. Change of username or service not allowed