Thank you Hanwha support, and thank you Russell, My scenario is there is only a Wisenet Wave server and a client and a few Hanwha cameras. There is no any other client or web browser trying to conn...
I rebooted the two cameras without making any configuration changes and issue fixed. Hope Hanwha technical support engineers to give instructions on how to avoid the issue happen again.
By the way, how to raise issue ticket to Hanwha support?