Qlik Sense - Unable to access the Qlik Sense Hub - Cannot establish a connection: Qlik Sense G3 Broker APIArticle Number: 000028192 | Last Modified: 2019/01/17
While accessing the Qlik Sense Hub you are unable to connect and get this error "Cannot establish a connection: Qlik Sense G3 Broker API"
Qlik Sense 3.x and later
The postgres Database gets overloaded slows down to respond and therefore causes connection issues
Resolution 1:Verify that all ports needed by the system are available. Review the official Qlik Help site for an updated list.
For example, port 9028 (Broker service, used Internal only) could be used by another software.
Resolution 2:If ports are available, to resolve this issue you can change the value set to the setting called "ReadAccessControlMode" (by default stored in C:\Program Files\Qlik\Sense\Repository\Repository.exe.config)
This settings governs what tools Qlik Sense uses to process the various security and sync rules to determine access to applications and resources within Qlik Sense. By default it is set to EntityFrameworkFiltering, which is an older more generic framework which handles large numbers of applications quite well but can run slowly if you have a large set of complicated rules.
To make the change simply:
1. Edit the Repository.exe.config file in your Qlik Sense install directory (by default C:\Program Files\Qlik\Sense\Repository)
2. Find ReadAccessControlMode
3. Change the value to "RepositoryFiltering"
4. Restart Qlik Sense Services
In a multi node environment we recommend to apply this setting on every node.
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