Network Management

NCM displays the error Unable to connect to remote polling engine XXXXXXX on the relevant server

This article describes what to check if you encounter the following error when you try to access NCM features: Unable to connect to polling engine XXXXXXX on the relevant server. Verify that NCM X.X or later is installed on the server

First published date

10/18/2018 9:24 PM

Last published date

5/5/2025 10:40 PM

Overview


Sometimes you encounter the following error when you try to access NCM Features:
 

Unable to connect to polling engine XXXXXXX on the relevant server. Verify that NCM 7.7 or later is installed on the server


The error above can be generic in nature. The resolution below is specific to a particular issue that can be identified by a particular error that you see in the NCM Business layer log on the polling engine referred to in the error message.

The error is also seen in the Orion web console when you browse the Advanced NCM job settings page,



Other Error:

You currently cannot connect to the main NCM server XXX either because the server is not yet upgraded to version 2020.2 or there is a problem with your network.


 

Product section

Network Configuration Manager

Cause

DCE component was not registered correctly.
Cached references in pub/sub

Resolution

Workaround 1: Examine the Windows Registry on each server (Main Poller, Additional Poller, and HA component):

Verify that the following value exists with the string entry named "DCE": 

  • HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\SolarWinds\AssemblyResolver\ResolvePaths
  • Verify that the value is <installation dir>\Orion\DCE. By default, this is C:\Program Files (x86)\SolarWinds\Orion\DCE\.

Workaround 2:

  • Remove file connections_released.data and recreate it by running the NCM node profile test. The file can be found at: C:\ProgramData\SolarWinds\Orion\CLI

Workaround 3:
 

    (For Main)

  • Repair SolarWinds Platform in programs and features and complete the Configuration Wizard.

    (For APE only)