ERA Server must be running on both servers to change the server your clients report to from OLD_SERVER to NEW_SERVER in ESET Remote Administrator (ERA). 

1. From ERA Console, connect to OLD_SERVER.
    
2. From the Clients tab, select all clients that currently connect to OLD_SERVER.
    
3. Right-click the selected clients, and select New Task → Configuration Task.
   

    
   
   Figure 1-1
   

4. In the Configuration for Clients dialog box, click Create…
   

    
   
   Figure 1-2
   

5. In the Configuration Editor, navigate to ESET Smart Security, ESET NOD32 Antivirus → ESET Kernel → Setup → Remote administration.
   

   
   
   Figure 1-3
   

6. Change the Server address to NEW_SERVER (no http://), or use the IP address of NEW_SERVER, in the form xxx.xxx.xx.x (again no http://).
    
7. To configure the update server, navigate to Update module → Profile → Setup.
   

   
   
   Figure 1-4
   

8. In the Update server parameter, enter the IP address of NEW_SERVER (http://xxx.xxx.x.x:xxxx).
    
9. Close the Configuration Editor and click Yes when asked to save changes.
    
10. Within a few minutes (according to the Interval between connections to server setting) the clients will pick up the configuration change and begin reporting to the new server.