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How to change number of allowed WebSocket Connections in Internet Explorer

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Tomasz_Gidzgier
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How to change number of allowed WebSocket Connections in Internet Explorer

 

The User is opening the Hub, then an Application and he sees a pop up with error:

An error occurred Connection lost. Make sure that Qlik Sense is running properly. If your session has timed out due to inactivity, refresh to continue working.

Trying to refresh does not solve the issue.

Environments:


Behavior :

With Internet Explorer it's possible to open one app in Edit mode, but for the second, the connections keep on spinning, and an error message is displayed with the Developer Tools.

000040520.png

 

Cause:


The problem is caused by the fact that Qlik Sense needs many open WebSocket connections depending on the app. Be default Internet Explorer allows a maximum of 6 connections (sometimes less) depending on the installation.

 

Resolution:


For up to date instructions, please refer to Qlik Sense Hub Error Cannot create connection or Error Occurred on REST Endpoint Call - Increase Web...


The below applies to older versions based on previous Microsoft suggestions:

See Microsoft Documentation 
WebSocket Maximum Server Connections


To modify this feature by using the registry, add the name of your executable file to the following setting.

For Internet Explorer 10:
HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                  FEATURE_WEBSOCKET_MAXCONNECTIONSPERSERVER
                      epxlorer.exe = (DWORD) 0x00000006 (6)

In some installations the above registry key might be located in the following location:


For Internet Explorer 11 and later:
HKEY_LOCAL_MACHINE (or HKEY_CURRENT_USER)
   SOFTWARE
      Microsoft
         Internet Explorer
            Main
               FeatureControl
                MAXCONNECTIONSPERSERVER
                    epxlorer.exe = (DWORD) 0x00000006 (6)

Note: The minimum number of WebSocket Connections that can be specified is 2 and the maximum value allowed is 128.

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Version history
Last update:
‎2021-05-19 10:47 AM
Updated by:
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