I have 40 Windows 2012 domain controllers (forwarding through heavy forwarders to cloud), that intermittently stop sending "WinEventLog:Security" events to cloud indexers. In some cases, one of the servers will send Security events for a few hours and then stop sending altogether. I know the events exist on the server because I can see them through Event Viewer. On the other hand, I don't have the same issue with the Application or System events. They flow all the time. The issue only happens with "WinEventLog:Security" events. So far, I have tried to split the load among 4 heavy forwarders, thinking it was a forwarder congestion issue. I also configured the domain controllers to send directly cloud, bypassing the heavy forwarders. Alas, no success. Has anyone experienced or heard about this issue? Thank you.
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