Omron NJ Series User Manual page 541

 Windows Vista, Windows 7, or later version
1
Open the Control Panel from the Windows Start Menu and then select Windows Firewall
icon.
The Windows Firewall Dialog Box is displayed.
2
Select Turn Windows Firewall On or Off.
The Customize Settings Dialog box is displayed.
3
Clear the Block all incoming connections, including those in the list of allowed programs
Check Box and click the OK Button.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
Appendices
A
A-37