Error: Socket hang up

[Osinedges]

First time using this rcon client, however for a sanity check I thought I'd try the same details in an ark server manager (gui based one). It worked with every server I had (7 total). I tried them all on with webrcon and none worked, all presented the following error, for obvious reasons I have omitted my server information but please be assured they were the correct ports,IP's & passwords as they all worked in other server managers. I also tried 127.0.0.1 & localhost instead of the public ip and no variations worked.

connecting to {OMITTED] ...
error: { Error: socket hang up
    at createHangUpError (_http_client.js:332:15)
    at Socket.socketOnEnd (_http_client.js:435:23)
    at Socket.emit (events.js:203:15)
    at endReadableNT (_stream_readable.js:1145:12)
    at process._tickCallback (internal/process/next_tick.js:63:19)
  code: 'ECONNRESET',
  type: 'error',
  target:
   WebSocket {
     _events:
      [Object: null prototype] {
        open: [Function],
        message: [Function],
        error: [Function],
        close: [Function] },
     _eventsCount: 4,
     _maxListeners: undefined,
     _socket: null,
     _ultron: null,
     _closeReceived: false,
     bytesReceived: 0,
     readyState: 0,
     supports: { binary: true },
     extensions: {},
     _binaryType: 'nodebuffer',
     _isServer: false,
     url: 'ws://OMITTED:OMITTED/OMITTED',
     protocolVersion: 13 } }
disconnected

Am happy to provide more information if needed.