HOW TO CREATE A LOG-IN BANNER ON AN NSM CLIENT/UI

To create a banner to deliver pre-log-in messages to users on an NSM, below is the procedure –

1 – Login as super user.

2 – Select Administer and Login as the super user.

3 – Select Administer.

4 – Select Server Manager , then Servers.

5 – Select GUI Server or GUI Server Cluster (HA Mode).

6 – Right click and Edit the GUI Server / GUI Server Cluster:
There is a place one can enter the Banner message in Log in Warning Message.

7 – Select OK. The message will appear in the Banner.

Reference –

https://kb.juniper.net/InfoCenter/index?page=content&id=KB29464&actp=search