I have enabled the nobuild flag with the /zone_flags panel and /zone nobuild true and neither are working.

Merged post

Also found out it was crashing the server, I have unloaded the plugin for now. But would love it working.

Crash error: 
UnityPlayer.dll caused an Access Violation (0xc0000005)
in module UnityPlayer.dll at 0033:948420fe.

Yeah we are getting server crashes with Zonemanager as well. The admins been trying to set up public zones, and when they are trying to build in the zones it will crash the server. Im not seeing any errors, it just restarts the server.

I also got this error
@k1lly0u 

Merged post

Are you using the UberTool plugin

Just seems like a classic update break, all we can do is hope they update the plugin soon.

Yep, I was setting a safe zone and everytime I'd start to build in the safe zone the server would crash and boot people. I ended up removing the zone and just stopping until an update to the plugin is created. :shrug:

The latest Rust update changed protocols, so some hooks are disabled.
https://umod.org/games/rust#changelog

The protocol isn't really the reason those were disabled, but yes, they were disabled because of issues and are/were likely causing this.

I see. Is it possible to recover?