Multiple continuous entries of Rule "Default Block SSDP" rejected UDP (17) traffic with (xxx.xxx.x.x Port ssdp 1900).

Hello,

This is something I've noticed under my NIS history for some time now under my firewall activities. They occur several times a minute and are continuous. Sometimes they occur at different ports. I've tried searching other similar posts and can't seem to find a clear cut answer as to what is occurring. I'm somewhat worried if there is some sort of on going attack or there is a possible infection. I have turned off network discovery. I've ran full system scans, I've used the NPE and malwarebytes and all have been clear. At this point I'm just wondering what is going on and if there is anything that needs my attention.

Thanks.