When entering the Filter Rules dashboard there is some idling (“Loading”) going on until I get a timeout.

The below system configuration changes, to increase the system resources such as file descriptors, have been seen to resolve this issue.

In /etc/security/limits.conf, add the below:

* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535

In /etc/sysctl.conf, add the below:

# Custom Config
net.ipv4.ip_local_port_range = 32800 61000
net.core.wmem_max = 8388608
net.core.wmem_default = 8388608
net.core.rmem_max = 8388608
net.core.rmem_default = 8388608
net.ipv4.tcp_rmem = 4096 8388608 16777216
net.ipv4.tcp_wmem = 4096 8388608 16777216
net.ipv4.tcp_mem = 4096 8388608 16777216
fs.file-max = 65535
# Custom Config End

These changes will require a reboot of the machine to take effect.