If your LYNX APPolo Server is not shown in the Connection Manager or does not connect to your APPolo GUI,

please check the following issues:


  1. Are you familiar with APPolo Quick Start Guide?

    1. http://www.lynx-technik.com/fileadmin/user_upload/pdf/Products/LYNX_APPolo_QuickStart.pdf
  2. My APPolo Server has a Version lower than 4.9.0:
    1. Please enable the following configuration key for MyComputer in your GUI (instructions see link below):
    2. Key: DISCOVERY_USES_REMOTEIF  Value: TRUE
    3. Instructions: https://lynxtechnikag.freshdesk.com/solution/categories/1000022723/folders/1000092969/articles/1000039703-application-note-029-rct5030-rct5031-server-5023-is-not-visible-in-the-connection-managemen
  3. My APPolo Server is connected through a gateway:
    1. If your APPolo Server version is below 8.0.0 please upgrade to the latest version.
    2. APPolo servers behind a gateway cannot be found automatically within the broadcast range of the APPolo GUI, therefore you have to use the manual search ("Find a specific IP address:") on the down right side in the Network Connections Editor - TAB.
  4. Restart the APPolo GUI / APPolo Server:
    1. Please check if  restartarting the APPolo GUI / power cycle of the APPolo Server solves the connection issue.


If none of the above solves the issues or is not relevant, please continue with the following steps:


Does a ping to the APPolo Server IP address work?

NO => Check the following steps: 

  1. Make sure the rack frame is connected to the network and the RCT5031 / RCT5023 - S / -GS is powered on and working correctly.
  2. Please check the IP address, Subnet -, Gateway settings of your APPolo Control Server.
  3. Make sure that the IP address is reachable from the network where your PC / laptop is currently connected to (contact your IT experts for details).
  4. Continue with the next step below if none of the steps above have helped.

YES => Is the Web - Interface reachable (type in the APPolo Server IP address in a browser)?

NO => Check the following steps: 

  1. Please make sure that all ports are reachable via the firewall (see required ports below):
  2. https://lynxtechnikag.freshdesk.com/support/solutions/articles/1000043541-firewall-settings-for-lynx-services-needed-ports
  3. Please make sure that no other device / LYNX device has the same IP address within the network.
  4. Continue with the next step below if none of the steps above have helped.

YES => Does the PC or laptop have more than one network connection (Open the Connection Manager and check the down left side: "IP address of this PC: ... < more than 1 IP?)

YES => Check the following steps: 
  1. Choose the IP address (shown in the connection manager down left side) which is within the network of your APPolo Server and set it as ORB Endpoint:
  2. Instructions how to set configuration key on MyComputer: https://lynxtechnikag.freshdesk.com/support/solutions/articles/1000034641-application-note-012-changing-appolo-control-configuration-settings-in-gui-and-lynx-servers
  3. Enter ORB_ENDPOINT in the left text field as the key, and the IP address e.g. 192.168.1.101 in the right text field as value (NOTE: Make sure that you have not entered any spaces before, within or at the end of the IP address).
  4. Restart the GUI.
  5. Continue with the next step below if none of the steps above have helped.

NO => Is the APPolo GUI application blocked by the windows firewall?

Yes or how to check? => Check the following steps:
  1. Windows Control Panel > Windows Firewall > Advanced Settings > Incoming Rules: All LYNX APPolo Control GUI entries are set to allowed?
  2. Continue with the next step below if none of the steps above have helped.

NO => Is the APPolo Server reachable via other PC's or laptops?

Yes => Check the following steps:
  1. Please restart your PC / laptop.
  2. If this does not help delete the local GUI settings folder (only local GUI settings will be deleted, e.g. server connections made for the GUI on this PC)
  3. WIN 7: C:\ProgramData\Lynx\c3_local 
  4. WIN XP German: C:\Dokumente und Einstellungen\All Users\Anwendungsdaten\Lynx\c3_local
  5. WIN XP Englisch: C:\Documents and Settings\All Users\AppData\Lynx\c3_local
  6. Reinstall the APPolo GUI if necessary.
  7. Continue with the next step below if none of the steps above have helped.



NO => Please contact LYNX Technical Support


Create a ticket on support.lynx-technik.com or write an EMail to support@lynx-technik.com

Technical Support Phone: +49 (0)6150 / 1817 - 171