Browse for targets in AS not working

If you happen to find no PLCs on the network using the “Browse” button in Automation Studio:

it could be that the “npf” driver is not running. You can check the status of the driver in the “System information” window. This window can be accessed easily in Win10 by clicking on the “Start” button and typing “System information”.
The “npf” driver is part of the WinPcap installation package available here
Reinstalling WinPcap may solve the problem.

If it just did not find your PLC then check if you have SNMP active for the PLC:
(under Physical view - Configuration of the Ethernet)