"events.js:174 Unhandled 'error' event" when trying to start websocket

I've been trying and struggling to get the webserver to run properly.
Each time I run the .\webserver -w command, I get the following error:

WebApp>.\webserver -w
start websocket signaling server ws://100.108.50.160
start as public mode
events.js:174
throw er; // Unhandled 'error' event
^

Error: listen EACCES: permission denied 0.0.0.0:80
at Server.setupListenHandle [as _listen2] (net.js:1263:19)
at listenInCluster (net.js:1328:12)
at Server.listen (net.js:1415:7)
at Function.listen (C:\snapshot\WebApp\node_modules\express\lib\application.js:618:24)
at new RenderStreaming (C:\snapshot\WebApp\build\index.js:0:0)
at Function.RenderStreaming.run (C:\snapshot\WebApp\build\index.js:0:0)
at Object.<anonymous> (C:\snapshot\WebApp\build\index.js:0:0)
at Module._compile (pkg/prelude/bootstrap.js:1433:22)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:787:10)
at Module.load (internal/modules/cjs/loader.js:651:32)
Emitted 'error' event at:
at Server.emit (events.js:198:13)
at emitErrorNT (net.js:1307:8)
at process._tickCallback (internal/process/next_tick.js:63:19)
at Function.runMain (pkg/prelude/bootstrap.js:1489:13)
at startup (internal/bootstrap/node.js:320:19)
at bootstrapNodeJSCore (internal/bootstrap/node.js:660:3)
​

I've tried using the webserver.exe downloaded via the Unity Download web app command using 3.1.0-exp.3 on two separate machines now, with the exact same result. Is there a step I'm missing or some configuration that needs to change?

Thanks, and let me know if more info would be useful.

 

Port 80 reserved on windows, and I didn't feel like messing with that, so I went ahead and set up a cert/key pair and got the https approach working!