Error: User modify failed. Cannot modify user on other node: Authentication by SSH key failed!

Error: User modify failed. Cannot modify user on other node: Authentication by SSH key failed!


Check the following on slave/secondary node


1. The error ’User modify failed Cannot modify user on other node: Authentication by ssh key failed’ would occur when the ezeelogin installed node has its public key missing in /root/.ssh/authorized_keys. To add the key, execute the following command 

cat /usr/local/etc/ezlogin/ >> /root/.ssh/authorized_keys


Check if the key is back in the file.

cat /root/.ssh/authorized_keys


2. Also, make sure that the port sshd is listening on the servers is given as the gateway port in Settings->General->Miscellaneous->Gateway SSH port

3. Also, make sure PubkeyAuthentication is set to ’YES’ in you sshd_config (sshd configuration) file. In Centos/RHEL/Fedora it would be

vi /etc/ssh/sshd_config

#set PubkeyAuthentication to yes

PubkeyAuthentication yes

service sshd restart


3. Also, make sure root login is permitted on the gateway server.


You can check this by doing

ssh root@localhost

and it should log you in else edit /etc/ssh/sshd_config and set  PermitRootLogin yes 

vi /etc/ssh/sshd_config

#Add the following lines to the end of  /etc/ssh/sshd_config to allow root login from localhost only

 Match Address

 PermitRootLogin yes

 service sshd restart

 and make sure you are able to authenticate with the the command 

ssh root@localhost

Make sure you are able to login after entering the password.

If you have enabled Allow Or Deny SSH Access To A Particular User Or Group in sshd.conf, make sure that the user root is allowed

  4. Also, make sure that the webuser(apache,nobody.etc) that the webserver(apache/nginx) runs as is able to read the keys in the dir /usr/local/etc/ezlogin.

  Make sure to grant the read privileges to

chmod o r /usr/local/etc/ezlogin/id_clkey
chmod o r /usr/local/etc/ezlogin/
usermod -G <current_groupname_of_id_clkey_files> <webserver_user>

5. Check the log file /var/log/secure

       tail  /var/log/secure



6. Reset Ezeelogin keys used for privilege escalation


     Reset Ezeelogin Authorization Keys






0 (0)
Article Rating (No Votes)
Rate this article
    Attached Files
    There are no attachments for this article.
    Related Articles RSS Feed
    Blank page when accessing Ezeelogin web panel or GUI
    Viewed 3430 times since Wed, Jun 14, 2017
    You don’t have permission to access /ezlogin/index.php/auth/login on this server
    Viewed 2281 times since Fri, Aug 10, 2018
    Connection has been closed. Another user may have logged in on the remote windows machine
    Viewed 3804 times since Thu, Jun 15, 2017
    getting config from other node failed
    Viewed 925 times since Wed, Jan 9, 2019
    UnAuthorized IP Address when using proxy
    Viewed 378 times since Mon, Jun 1, 2020
    Unable to ssh / An error occurred. Please contact administrator /
    Viewed 2721 times since Thu, Jun 15, 2017
    Error while logging with saml credentials
    Viewed 191 times since Fri, Sep 25, 2020
    Error opening terminal: xterm-256color.
    Viewed 1287 times since Wed, Jul 31, 2019
    Unable to connect to your database server using the provided settings.
    Viewed 9193 times since Thu, Jun 15, 2017
    Blank page when clicking add server
    Viewed 2272 times since Wed, Aug 16, 2017