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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > Agents can't connect to Agent Management Service

Agents can't connect to Agent Management Service

Created by Chris Foley, last modified by Tara Duval on Nov 14, 2018

Views: 5,514 Votes: 0 Revisions: 9

Updated November 14, 2018


This article provide some information about likely issues you may face during download/installation or operation of Solarwinds Orion Agent.

  • When you try to download the Orion Agent from Web console, you receive the following error:

Error getting agent installer for download. There was no response from the Agent Management Control Service located at "solarserv:17777"

  • During installation of Orion Agent, you see the following error:


  • IIS's httperr file fills up the drive with the following errors: /solarwinds/agentmanagement/solarwinds/messaging/signalr/negotiate?clientProtocol=1.3 404 - NotFound.
  • BusinessLayerHost.log file contains the following error when starting the DPI Business Layer plugin:
    ERROR SolarWinds.BusinessLayerHost.PluginInstanceAppDomain - Plugin "DPI Business Layer" failed to start. System.Runtime.Serialization.SerializationException: Unable to find assembly 'SolarWinds.DPI.BusinessLayer, Version=, Culture=neutral, PublicKeyToken=null'.
  • AgentManagent.Service.log and AgentManagement.AMSProxy.log files are not getting updated.


  • Includes QoE (DPI) module
  • NPM and SAM 12.x


  • Agent Management Service is not started or plugin is disabled.


Launch Orion Service Manager and ensure Solarwinds Agent Service is running. If service is running but you are still having issues, then follow the steps below:


  1. Run Notepad as Administrator.
  2. Open the following file:
  3. Find the following line:
    <SolarWinds.BusinessLayerHost LoadPlugins="false"
  4. Change it to the following:
    <SolarWinds.BusinessLayerHost LoadPlugins="true"
  5. Stop and re-start the Orion Module Engine service.


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