Showing results for 
Search instead for 
Did you mean: 

DXL client connection to Broker fails after a while


we have some Windows clients with a strange DXL client behaviour. After the deployment of the DXL Client 3.1 the client can establish a DXL connection with the broker. After a day or two the same client ist not able to connect to the Broker anymore. In the dxl_service log on the client we find the following entry:

[P6][Debug] DxlConnection: attempting to connect to ssl://
[P6][Debug] DxlConnection: keep alive 1800
[P6][Error] DxlMQTTConnection: Error creating socket
[P6][Debug] DxlConnection: MQTTClient_connect failed

If we run an uninstall Client-Task of the DXL client and install it again on, the client can establish the connection to the Broker again:

[P7][Debug] DxlConnection: attempting to connect to ssl://
[P7][Debug] DxlConnection: keep alive 1800
[P7][Information] DxlConnection: MQTTClient_connect succeeded for url = ssl://

Did somebody exerience such issues?

We have hundreds of clients that are connected to the broker and work fine. But we have about 40-50 clients that are losing the DXL connection to the Broker with the same error in the logs. Alle clients are in the same network with the same policies and settings.

Maybe someone know about this issue.


1 Reply

Re: DXL client connection to Broker fails after a while

Do you have any 3rd party security software that may be doing DLL injection?

We have seen this before where something will inject itself into the Winsock DLLs as we are loading them - and that causes us to partially block them.   The error you are reporting is the failure to create a basic socket - before it's been bound to any target.

If you can open a SR with support we can capture MERs and look at this further.

More McAfee Tools to Help You
  • Subscription Service Notification (SNS)
  • How-to: Endpoint Removal Tool
  • Support: Endpoint Security
  • eSupport: Policy Orchestrator
  • Community Help Hub

      New to the forums or need help finding your way around the forums? There's a whole hub of community resources to help you.

    • Find Forum FAQs
    • Learn How to Earn Badges
    • Ask for Help
    Go to Community Help

    Join the Community

      Thousands of customers use the McAfee Community for peer-to-peer and expert product support. Enjoy these benefits with a free membership:

    • Get helpful solutions from McAfee experts.
    • Stay connected to product conversations that matter to you.
    • Participate in product groups led by McAfee employees.
    Join the Community
    Join the Community