In my experience I've never had to adjust anything on the client side.
If you do have trouble on the client side you may want to verify that the network you are connected to is marked Private. Sometimes you get strange behavior if Public is selected. The process to do this varies by Operating System but in Windows 10 it is Settings>Network & Internet>Ethernet>Click on the Network name (usually Local Area Connection if wired)>turn on the Make this PC discoverable
On the server you will definitely need to configure the firewall. Assuming you are using a standard configuration, you will need to open up port 8555. Again, this process will vary depending on which server OS you are running.
This page from the wiki might also be of some help: http://brwiki2.brulescorp.com/index.php?title=Client_Server