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.
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.
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.