Why won't fire spread?

[Hotelmariofan]

So I started a server and at the beginning fire wouldn't spread and water wouldn't run and everything. Well for some reason essentials was set by default to prevent all of those things. So I enabled them. Well now water flows, but fire still won't spread. Any idea why this may be? Thanks in advanced.

[zeuslightning125]

If you have towny, it will also turn this off. Pretty much all anti greif plugins by default turn off fire spread and stuff, so check all of them. Yes, towny is one.