SPC-OCA-10360: Connection lost. Either the server is not running or a network problem is preventing access

Products

• Spectrum
• Network Observability

Issue/Introduction

A new SpectroSERVER was installed in a DSS (Distributed SpectroSERVER) environment, but the OneClick web server cannot access it.

Environment

DX NetOps Spectrum 22.2.x or later

Cause

There could be a few communication issues causing this. 

1. Hostname cannot be resolved and missing hostname in the Host Resource Configuration (.hostrc) File
2. Network/firewall blocks access
3. Tomcat cache needs to be refreshed

Resolution

Test the port connections as follows:

1. nc or telnet from OneClick server to SpectroSERVER
   [root@OneClick]$ nc -z -v <SpectroSERVER_HOST> 14002
   OR
   [root@OneClick]$ telnet <SpectroSERVER_HOST> 14002
   
   
2. nc or telnet from SpectroSERVER to OneClick
   [root@SpectroSERVER]$ nc -z -v <OneClick_HOST> 14001
   OR
   [root@SpectroSERVER]$ telnet <OneClick_HOST> 14001

Depending on what results are returned, you can do the following:

• Add the IP/hostname pair in the ~/etc/hosts file. And add the hostname in the .hostrc file via Spectrum Control Panel - Host Security
  
  
• Disable internal firewall on OneClick host
  
  
• Restarted Tomcat service on OneClick host

Additional Information

https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/spectrum/22-2/administrating/distributed-spectroserver-administration/setting-up-a-distributed-spectroserver-environment.html