Click on the actual flag. It will eventually lead you the exact error\problem.
This may be because of a datasource, not receiver.
Have you configured end device to forward data to SIEM??
Let us know which product are you trying to integrate and we can help you out.
yes I configured End devices to forward logs to receiver.
Mainly I'm facing issue with McAfee web gateway 5500 & McAfee NSM. And im not sure about this device configuration.
For McAfee Web Gateway you can use syslog mechanism and below link to configure Web Gateway Best Practices: Configuring Syslog on Web Gateway 7.x
For NSM you need to download NSM configuration utility and need to add it as a McAfee device, You can use the below link to configure NSM McAfee KnowledgeBase - How to configure the NSM configuration utility