For both existing and new Qlik Alerting deployments customers will see a variety of errors when connecting to Qlik Sense.
In the developer tools and when testing the connection the following response error can be seen:
Unexpected server response: 403
Resolution
Follow these steps to resolve the issue:
- Install Qlik Alerting November 2024 SR1 (or later releases)
- Go to C:\Program Files\Qlik Alerting\config
- Open default.json
- Change "webSocketEnabled" to true

- Restart Qlik Alerting services
Cause
In Qlik Sense November 2024 CSRF protection was extended to Websocket requests and added support for CSRF to add-on products. This includes Qlik Alerting for Windows.
Internal Investigation ID(s):
QCB-30970
Environment
- Qlik Alerting
- Qlik Enterprise on Windows November 2024 and later