All supported DX NetOps Portal releases
A code defect related to the Portal Event Manager Data Source being configured for SSL (aka TLS) using the HTTPS scheme.
There is no workaround for the issue without code change or changing the Event Manager service back to a non-SSL configuration.
Disabling SSL for the Event Manager Data Source is neither simple nor recommended . The recommended workaround is using the OneClick WebApp UI for Alarm management.
This will be resolved through defect ID DE161772. That defect is scheduled for inclusion in the DX NetOps 24.3.6 release. That is an ETA, it is subject to change.
When 24.3.6 goes GA confirm DE161722 is listed in the Resolved Issues list prior to upgrading to implement the resolution.