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

Products

• CA Spectrum
• DX NetOps

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 20.2 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
   [[email protected]OneClick]$ nc -z -v <SpectroSERVER_HOST> 14002
   OR
   [[email protected]OneClick]$ telnet <SpectroSERVER_HOST> 14002
   
   
2. nc or telnet from SpectroSERVER to OneClick
   [[email protected]SpectroSERVER]$ nc -z -v <OneClick_HOST> 14001
   OR
   [[email protected]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

TechDocs : DX NetOps Spectrum 21.2 : Setting Up a Distributed SpectroSERVER Environment