Hi,
New to this forum,
I own a Dahua DHI-NVR5216-16P-4KS2E [V4.001.0000006.0, Build Date: 2021-02-08 ]and recently noted a long beep from the system, never heard such beep before, looked at the system log and noticed 5 failed login attempts and again after few minutes heard same long beep and...