Agents not communicating with the core server

Version 3

    Verified Product Versions

    Endpoint Manager 9.6Endpoint Manager 2016.xEndpoint Manager 2017.x

    Purpose

     

    This document was created to cover various reasons why the agent won't communicate with the core server.

     

    Solution

     

    1. Agent discovery is not working (agent status icons) - Agent Status Icons Suddenly Not Appearing in Console
    2. Firewall ports may be blocked - Ports used by LANDESK Management Suite - Full List
    3. Check that the following registry key exists on the core server:
      HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL, Value name: ClientAuthTrustMode, Value type: REG_DWORD, Value data: 2
    4. Possibly related to database exceptions - 6 Overlooked Problems related to Database Exceptions
    5. Inventory is not processing your scans - 10 simple checks to Troubleshoot Inventory - Devices not updating, Duplicated or Missing Scans
    6. Inventory scans failing on client machines - Running Inventory Scan on a Client Machine Results in Error Message "The Inventory Server Did Not respond"
    7. Vulscan is failing to check in with the core server - About Vulscan and SSL Verification