VNC consoles are returning "Something went wrong, connection is closed" while doing a minor update

Issue

• VNC consoles are returning "Something went wrong, connection is closed" while doing a minor update:
  

  

• /var/log/containers/nova/nova-novncproxy.log show an error similar to this one:

2020-03-30 15:02:21.669 31 INFO nova.console.websocketproxy [req-4f2dc286-6f15-4cbb-80fb-ea3dcfb694a0 - - - - -] handler exception: The token '' is invalid or has expired
2020-03-30 15:02:21.670 31 DEBUG nova.console.websocketproxy [req-4f2dc286-6f15-4cbb-80fb-ea3dcfb694a0 - - - - -] exception vmsg /usr/lib/python2.7/site-packages/websockify/websocket.py:875
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy Traceback (most recent call last):
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/websockify/websocket.py", line 930, in top_new_client
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     client = self.do_handshake(startsock, address)
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/websockify/websocket.py", line 860, in do_handshake
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     self.RequestHandlerClass(retsock, address, self)
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/nova/console/websocketproxy.py", line 242, in __init__
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     websockify.ProxyRequestHandler.__init__(self, *args, **kwargs)
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/websockify/websocket.py", line 114, in __init__
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     SimpleHTTPRequestHandler.__init__(self, req, addr, server)
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib64/python2.7/SocketServer.py", line 649, in __init__
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     self.handle()
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/websockify/websocket.py", line 581, in handle
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     SimpleHTTPRequestHandler.handle(self)
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib64/python2.7/BaseHTTPServer.py", line 340, in handle
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     self.handle_one_request()
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib64/python2.7/BaseHTTPServer.py", line 328, in handle_one_request
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     method()
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/websockify/websocket.py", line 543, in do_GET
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     if not self.handle_websocket():
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/websockify/websocket.py", line 531, in handle_websocket
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     self.new_websocket_client()
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy   File "/usr/lib/python2.7/site-packages/nova/console/websocketproxy.py", line 158, in new_websocket_client
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy     raise exception.InvalidToken(token=token)
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy InvalidToken: The token '' is invalid or has expired
2020-03-30 15:02:21.670 31 ERROR nova.console.websocketproxy