Spectrum Performance View Page No Longer Connects

Products

• Network Observability

Issue/Introduction

The Spectrum Performance View (SPV) page fails to load or connect, even though the SpectrumInsideView process is running on the OneClick server. The local
   operating system firewall (e.g., firewalld) is confirmed to be disabled, and restarting the tomcat and processd services does not resolve the issue.

Using powershell from the end user's desktop testing tcp connectivity fails 

test-netconnection -Computer <Server_IP> -port 3000
# Output: TcpTestSucceeded : False, status: TimedOut

 

Environment

• DX NetOps Spectrum 24.3, 25.4
• Performance View / Grafana integration

Cause

The issue is caused by an external network firewall or security appliance (such as Zscaler or a corporate VPN policy) blocking traffic on TCP port 3000 (grafana default port), which
is required for the Grafana-based Performance View. This can occur even if the Spectrum server's local firewall is disabled.

Resolution

1. Verify Local Port Status: Confirm that the service is listening locally on the Spectrum server:
   bash

    

   sudo netstat -anp | grep 3000

2. Perform Client-Side Test: From the user's workstation, run a connectivity test to the Spectrum server IP on port 3000 using PowerShell:
   powershell

    

   test-netconnection -Computer <IP_ADDRESS> -port 3000

3. Check Intermediate Firewalls: If the test fails with TimedOut, contact your network security or firewall administrator.
4. Permit Traffic: Request that the security team allow inbound traffic on TCP port 3000 for the Spectrum server's IP address within the corporate firewall or VPN solution (e.g., Zscaler policy).
5. Validation: Once the rule is updated, re-run the test-netconnection command to confirm TcpTestSucceeded : True. The Performance View page should now load correctly.