A code error appears and configuration building and synchronization of settings and data to other system nodes do not work properly.
If you add a subnet with IP addresses that will contain the IP of the system nodes, and then delete this subnet, you will get a code error. We noticed the problem in version 2.3.17 NACVIEW.
Recommendation until fix: add this subnet to the system again. The fix will be in version 2.3.18.