Files:

Note: In the paths below, XX is your number version of Point of Sale.

Eftsvr.exe C:\Program Files (x86)\Intuit\QuickBooks Point of Sale XX\
DataImporter.exe C:\Program Files (x86)\Intuit\QuickBooks Point of Sale XX\
QBPOS.exe C:\Program Files (x86)\Intuit\QuickBooks Point of Sale XX\
QBDBMgr.exe C:\Program Files (x86)\Intuit\QuickBooks Point of Sale XX\DatabaseServer\
QBDBMgrN.exe C:\Program Files (x86)\Intuit\QuickBooks Point of Sale XX\DatabaseServer\
QBPOSDBService C:\Program Files (x86)\Intuit\QuickBooks Point of Sale XX\DatabaseServer\

Ports:

For instructions on configuring ports within the Windows Firewall, see the Microsoft article Open a port in Windows Firewall.

TCP (incoming) 8443, 443, 2638, 46203, 46216 through 46220, 8024, 8025, 8035, 8036
UDP (outgoing) 2638, 8024, 8035, 8036