Error: read ECONNRESET

[cvhariharan]

While I try to connect to TightVNC server using the example code provided in the README, I get this error { Error: read ECONNRESET at TCP.onStreamRead (internal/stream_base_commons.js:111:27) errno: 'ECONNRESET', code: 'ECONNRESET', syscall: 'read' } This could be a simple issue but any help would be appreciated.

[sidorares]

difficult to tell just from the error. Can you double check ip / port values are correct? Can you connect with some other client?

[cvhariharan]

I am able to connect with RealVNC viewer, the port and IP all seem to be correct.

[sidorares]

is this the only connection? Some vnc servers try to close all existing connections whenever new connection is made

[cvhariharan]

I think I may have found out the issue. Seems like a problem with calling requestUpdate. Commenting it out, the connection is successful.

[sidorares]

hm, updates are not sent automatically, usually a send 'requestUpdate' command immediately after receiving update. Do you receive any data after commenting this out?

[cvhariharan]

I am able to receive clipboard and resize events.

[sidorares]

I think requestUpdate is for screen rectangles, resize & clipboard sent automatically ( but I might be wrong here and could be server specific )

[cvhariharan]

I don't think I am able to receive any screen updates after commenting out requestUpdate

[sidorares]

Is there an easy way to replicate your issue? What's your os?

[cvhariharan]

OS: Windows 10 64 bit VNC server: TightVNC 2.8.11 with localhost connection enabled Node v10.16.0 Rfb2 0.2.0 NPM 6.9.0

var rfb = require('rfb2');
var r = rfb.createConnection({
  host: 'localhost',
  port: 5900,
  password: 'password'
});

r.on('connect', function() {
  console.log('successfully connected and authorised');
  console.log('remote screen name: ' + r.title + ' width:' + r.width + ' height: ' + r.height);
});

r.on('error', function(error) {
  console.error(error);
});

r.on('rect', function(rect) {
   console.log(rect.encoding)
});

r.on('resize', function(rect) {
  console.log('window size has been resized! Width: %s, Height: %s', rect.width, rect.height);
});

r.on('clipboard', function(newPasteBufData) {
  console.log('remote clipboard updated!', newPasteBufData);
});

r.on('bell', console.log.bind(null, 'Bell!!'));
// r.requestUpdate(false, 0, 0, r.width, r.height);

[sidorares]

you can only do requestUpdate after client is connected, otherwise you write this command before connection handshake is finished

[cvhariharan]

Oh, that fixed the issue. Thanks a lot!

[sidorares]

just tried on windows laptop and not I'm getting any screen updates, did you have any luck?

Note that requestUpdate is sent after connection automatically - https://github.com/sidorares/node-rfb2/blob/822d0eafc3604abad57996faa208aaa1acb9a4cb/rfbclient.js#L241

[sidorares]

I should really update readme, the code is just a list of supported methods, not a working example

[cvhariharan]

No, I don't seem to receive any updates

just tried on windows laptop and not I'm getting any screen updates, did you have any luck?

Note that requestUpdate is sent after connection automatically -

https://github.com/sidorares/node-rfb2/blob/822d0eafc3604abad57996faa208aaa1acb9a4cb/rfbclient.js#L241

No, I don't seem to receive any updates

[sidorares]

you need to pass non empty list of supported encodings:

var r = rfb.createConnection({
  host: 'localhost',
  port: 5900,
  password: 'password',
  encodings: [rfb.encodings.raw]
});

[sidorares]

actually, it's set bu default to [raw, copyRect, pseudoDesktopSize] but for some reasons I only get updates when set it to raw only

[cvhariharan]

The event, rect would be triggered whenever there is a screen update right? If that's the case, I am still not receiving the update events after the initial one.

[sidorares]

I'm getting updates now with [rfb.encodings.raw]

[cvhariharan]

Do we have to call requestUpdatein the callback for rect?

[sidorares]

yes