Spooler showing black connection status and no information in GUI

Products

• DX Unified Infrastructure Management (Nimsoft / UIM)

Issue/Introduction

Robots are seeing connections issue with the spooler probe. In the Infrastructure Manager (IM), the spooler is showing a "black connection" status with no information available.

 

When running netstat for the spooler port (48001), the output shows multiple SYN_SENT states: tcp 0 1 ##.##.#.#:##### #.##.#.#:48001 SYN_SENT

Environment

• DX UIM 23.4.*
• any robot version

Cause

The spooler "black connection" is caused by a local networking environment failure where the server is unable to ping or communicate with itself via its own IP address. This prevents the robot components from establishing the required internal communication on port 48001.

Resolution

To Resolve the issue:

1. un ping <server_IP> from the command line of the problematic machine.
   
   
2. Attempt a curl -v http://<server_IP>:48001 to check for local port binding accessibility.
   
   
3. If these fail or hang while ping localhost or ping 127.0.0.1 works, the local routing table or network configuration is preventing self-communication. Engage the Network or OS Administration team to investigate why the server cannot route traffic to its own assigned IP address. The server must be able to "ping itself" for the UIM robot to function correctly.