Prevent capturing of a session by same user

[dzihan]

How can I prevent that a user, which logs into a server where a user with the same login credentials is already logged in takes over the session of that user?

The situation is

• the setup requires an account which is used by several people with the same login
• if the first user opens a NX session on the server, he starts working as usual
• if another user connects with the same login (not knowing about the other logged in user), he immediately receives that running session without any warning
• there is no window indicating “Resume, New, Cancel”, the session immediately gets connected

 

I would like to

• make sessions exclusive, only the first user can log in
• all further login attempts with the same user name shall be denied with an error message until the first user logs out

 

How can this be achieved?

[reza]

Are you connecting to NoMachine Server installed on Windows or Linux?

[dzihan]

The NX server runs on Linux, the clients connect on Windows machines.

[reza]

You can limit access to your system by adjusting PAM configruation – http://www.linux-pam.org/.

As a alternative you can implement a script executed by NoMachine server after successful authorization.
Script can check who is already using NoMachine and return a error if there is already a session started by that user.

https://www.nomachine.com/DT01L00064#9

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