When we click on the “Active Response Health Status” option on McAfee EPO, we see that there is an error in McAfee Active Response(MAR) Server. On the “Active Response Health Status” page, we click on the Mcafee MAR server as follows. When we click on the “DXL Connection” tab on the incoming screen, “Unable to reach TIE Server via DXL. McAfee ePO can’t connect to TIE Server.” we see the error. Follow the steps below to resolve this issue.

Error
[-]
Unable to reach TIE Server via DXL.

McAfee ePO can't connect to TIE Server.

Possible cause:
- TIE Server is transitioning between operation modes. It won't connect until this process is complete. Wait a few minutes, and refresh the page to see the latest status.
- TIE Server upgrade is running. On Secondary servers, this process might involve a full database sync with the Primary server, which might take several minutes. Check /tmp/reconfig-tie.log to monitor the progress.
- No service registered on DXL Fabric for this TIE Server. Check service status on the appliance.
- No DXL brokers available for connecting McAfee ePO and TIE Server. Check connection status of DXL Client for ePO.
- Verify that DXL Topology settings and DXL Fabric are configured correctly.

Resolving “Unable to reach TIE Server via DXL. McAfee ePO can’t connect to TIE Server” Error

If the problem is not resolved when you do the suggestions in the “Possible cause” tab on the ePO, there may be a connection error due to the network. For this, restart the MAR server with a root user as in the picture below. After 5-10 minutes the problem will be fixed.

Possible cause:
- TIE Server is transitioning between operation modes. It won't connect until this process is complete. Wait a few minutes, and refresh the page to see the latest status.
- TIE Server upgrade is running. On Secondary servers, this process might involve a full database sync with the Primary server, which might take several minutes. Check /tmp/reconfig-tie.log to monitor the progress.
- No service registered on DXL Fabric for this TIE Server. Check service status on the appliance.
- No DXL brokers available for connecting McAfee ePO and TIE Server. Check connection status of DXL Client for ePO.
- Verify that DXL Topology settings and DXL Fabric are configured correctly.

The following screen shows that the problem has been resolved.