Niagara R2 Error: Cannot Open Web Server Socket (Port Conflict)

[Product_Support]

Issue

When attempting to open a Niagara R2 Enterprise Server station, the following error occurs:

Cannot open web server socket. [ServerLoop.run] 
java.net.BindException: Address already in use: JVM_Bind

Product Line

TAC IA Series

Environment

Niagara R2 Enterprise Server all version

Cause

Windows IIS uses Port 80 by default, which conflicts with the Niagara R2 Enterprise Server station database that also uses Port 80. This prevents the Enterprise Server from binding to the port.

Resolution

• Disable IIS if not required:

  1. Open Control Panel → Add/Remove Programs → Add/Remove Windows Components.
  2. Deselect Internet Information Services (IIS) and complete the removal.
  3. On Windows 7, set World Wide Publishing Service to Manual in Services to prevent auto-start.

• If IIS is required, change the Niagara R2 Enterprise Server port:

  1. Open WorkPlace Pro Admin Tool and stop the Enterprise Server.
  2. Open the Enterprise Server station offline.
  3. Right-click the station → Properties → Config tab.
  4. Change httpPort to a new port (e.g., 8080) and click Apply.
  5. Save and restart the Enterprise Server.
  6. Update all references (address tables, browser URLs) to include the new port (e.g., http://192.168.1.142:8080).