After editing Packet Filter rules you might want to verify what you just edited before enabling the rules. Here is what I usually do on my server to not screw up the whole installation and being able to quickly get back to my previous conﬁguration.
The default boot delay under FreeBSD is 10 seconds. This can drive you crazy if your server is down.
Another reminder of my classics. Sometimes, when you reduce data in a data frame some levels of categories are no longer contained in the observations after ﬁltering but the factors still contain them in their levels.
This is a classic in R and I tend to forget it every once in a while. So I write it down as a note for my future me.