[Check_mk (english)] Network Scan feature stopped working

Hello,

I have been slowly building a distributed monitoring system using Check_MK for my organization. I currently have 15 nodes / sites that I have setup and configured. Everything seems to be working ok, however, on the first couple of sites,
I was able to setup the “network scan” feature on a folder and it would query all available hosts on that subnet and then they could be added to the monitor system. For some reason, this feature has stopped functioning, and it doesn’t matter if I attempt
to set it up from the main host, or if I use the nodes at the site, it will no longer run. Any help would be greatly appreciated. I have searched all over and have not been able to find any documentation or support to help resolve this issue. If anyone
has experienced a similar situation and was able to resolve it, please let me know. I am trying to use this as a proof of concept to get buy in from leadership to purchase the enterprise edition.

Thank you,

Benjamin Chase

IT Infrastructure Security Support Engineer