Before configuring the link with WinCC OA, it’s interesting to understand the architecture between the 2 products:
The communication is done through the port TCP 9000. The ALERT software do the connection to the port 9000 of the WinCC OA server. If you have a firewall between the 2 servers, the TCP Port 9000 must be open in the way ALERT server to WinCC OA server.
ALERT and WinCC OA can be installed on the same computer or on 2 different.