When executing NoMachine custom scripts before the starting of the session, administrators should be able to define the text of message to be displayed to users when their access is denied for some reasons.

For example, when a user is denied on the server by the custom script executed in the 'UserScriptAfterLogin' key,
it should be possible to configure a custom message to be displayed in the browser or in the client gui.
The default message is "ooops, execution of custom script failed", which can be misleading when the user's access is denied instead because of browser version, username, client IP or client type (browser, client).