Connection to the Qlik Sense engine failed for unspecified reasons randomly on the hubArticle Number: 000026059 | Last Modified: 2019/08/14
When several tabs are opened at the same time, the error appears on one of the tab but not on others, showing that this is not a general loss of connection.
Another symptom is when selecting a data source (to attach files), it is throwing the error dialog saying "Data Profilling connection failed. Refresh your browser."
In some environments, where IPv6 is turned off on the NIC, Qlik Sense will try to bind to IPv6 and fail.
The change to the Engine's settings file disables IPv6 usage.
Turn Off IPv6 in the Network Interface Adapater
1) Check your version, is it earlier than 3.2?
2) Stop Engine + Service Dispatcher
3) Edit Engine's Settings.ini (C:/Programdata/Qlik/Sense/Engine) :
(with a blank line at the end)
4) Start Engine + Service Dispatcher
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