Issue connecting to the VNC server provided by an instance on vSphere

[KeithMnemonic]

I have an vm running on ESXi. Using RealVNC, I can directly connect to the VNC server provided by ESX to that vm so I know the ESX firewall is correct. If I try the same using websockify with vnc.html. I get one of two errrors.

In the first case , using Chrome developer tools, I can see it connect and it will actually register mouse clicks. The instant you type any character in the vnc screeen though it fails with

Sending keysym (down): 100
keyboard.js:42 onkeyevent up, keysym: 100 , code: KeyD
rfb.js:376 Sending keysym (up): 100
rfb.js:685 Failed while connected: Unsupported encoding (encoding: -260)
_fail @ rfb.js:685
_framebufferUpdate @ rfb.js:1517
_normal_msg @ rfb.js:1422
_handle_message @ rfb.js:725
_recv_message @ websock.js:304
rfb.js:635 New state 'disconnecting', was 'connected'.
rfb.js:427 >> RFB.disconnect
keyboard.js:276 >> Keyboard.allKeysUp
keyboard.js:281 << Keyboard.allKeysUp
websock.js:239 Closing WebSocket connection

Also sometimes it just fails with this error

Starting VNC handshake
websock.js:221 << WebSock.onopen
websock.js:224 >> WebSock.onclose
rfb.js:211 WebSocket on-close event
rfb.js:688 Failed when connecting: Connection closed (code: 1006)
_fail @ rfb.js:688
(anonymous) @ rfb.js:222
(anonymous) @ websock.js:225
rfb.js:635 New state 'disconnecting', was 'connecting'.

Should this work with recent versions of ESXi/vSphere hypervisors?

[KeithMnemonic]

This is what a packet capture shows for the "encoding" error

Frame 159: 4967 bytes on wire (39736 bits), 4967 bytes captured (39736 bits)
Linux cooked capture
802.1Q Virtual LAN, PRI: 0, DEI: 0, ID: 868
Internet Protocol Version 4, Src: 10.84.79.7, Dst: 10.84.43.131
Transmission Control Protocol, Src Port: 5900, Dst Port: 54066, Seq: 515, Ack: 953, Len: 4895
Virtual Network Computing
Server Message Type: Framebuffer Update (0)
Padding
Number of rectangles: 15
Rectangle #1
X position: 0
Y position: 0
Width: 672
Height: 16
Encoding type: Unknown (-260)
Rectangle #2
X position: 41102
Y position: 34048
Width: 35152
Height: 20039
Encoding type: Unknown (218765834)
Rectangle #3
X position: 0
Y position: 13
Width: 18760
Height: 17490
Encoding type: Unknown (672)
Rectangle #4
X position: 0
Y position: 16
Width: 2051
Height: 0
Encoding type: Unknown (16693053)
Rectangle #5
X position: 43776
Y position: 0
Width: 1616
Height: 19540
Encoding type: Unknown (1157627904)
Rectangle #6
X position: 43690
Y position: 43539
Width: 25471
Height: 60416
Encoding type: Unknown (148297)
Rectangle #7
X position: 17473
Y position: 21608
Width: 33261
Height: 22347
Encoding type: Unknown (-1295831032)
Rectangle #8
X position: 3063
Y position: 49140
Width: 31627
Height: 9222
Encoding type: Unknown (616591074)
Rectangle #9
X position: 32294
Y position: 26321
Width: 18797
Height: 16416
Encoding type: Unknown (1688722870)
Rectangle #10
X position: 26059
Y position: 40550
Width: 8863
Height: 3327
Encoding type: Unknown (563861481)
Rectangle #11
X position: 15175
Y position: 12411
Width: 24210
Height: 188
Encoding type: Unknown (-2037559009)
Rectangle #12
X position: 26904
Y position: 7051
Width: 23405
Height: 15287
Encoding type: Unknown (-1281495013)
Rectangle #13
X position: 60772
Y position: 9161
Width: 63593
Height: 15347
Encoding type: Unknown (80369837)
Rectangle #14
X position: 32198
Y position: 53319
Width: 43705
Height: 1377
Encoding type: Unknown (818896154)
Rectangle #15
X position: 61864
Y position: 65503
Width: 4997
Height: 62104
Encoding type: Unknown (157673645)
Server Message Type: Unknown (241)

[KeithMnemonic]

this is actually an issue with noVNC and not websockify, novnc/noVNC#1273