Configuring Windows Firewall for Niagara R2 Interstation Communication

[Product_Support]

Issue

Interstation links between UNC and Enterprise Server are not functioning in Niagara R2 due to blocked unsolicited messages.

Product Line

TAC IA Series

Environment

• Niagara R2
• Windows XP, Windows Vista, Windows 7
• UNC and Enterprise Server communication

Cause

Windows Firewall is enabled by default on desktop operating systems after Windows XP SP1.
By default, Windows Firewall blocks unsolicited TCP packets, including alarms and interstation links from UNC to Enterprise Server, unless exceptions are configured.

Resolution

Overview:
Windows Firewall is a stateful packet filter. To allow Niagara R2 interstation communication, create exceptions for required ports or programs.

Option 1: Program Exception (Preferred)

• Open Windows Firewall from Control Panel.
• Add program exception for nre.exe located in:
  C:\Niagara\<Version>\Nre\Bin\nre.exe
• Configure scope:
  • Any computer (least secure)
  • My network (subnet) only (recommended)
  • Custom list (most secure)

Option 2: Port Exceptions

• Add TCP ports: 80, 3011
• Repeat for UDP ports if required.
• Configure scope as above.

Windows 7 Advanced Settings:

• Create Inbound Rules for nre.exe or custom TCP/UDP ports.
• Apply to appropriate profiles: Domain, Private, Public.
• Name rules clearly (e.g., “Niagara 80, 3011 TCP”).