so not sure if I screwed something up or not, can't find anything my side. So first I get a crash when I place a firewall pipe and again after server restart if I try to access the interface.
http://pastebin.com/4RiEZp1K

I am using PR 4.4.3 build 42
Forge 10.12.2.1155-mc172
Saw FMP listed in the crash log incase it is relevant I am using FMP 1.7.2-1.1.0.289

Fixed via eca9adc