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[Sylvain Bauza <sbauza@xxxxxxx>]

Have you restarted the specific nova-consoleauth service ?

TBC, the VNC console is one way to quickly access the instance, but if you need more, there are other ways to connect the guest :
https://docs.openstack.org/nova/pike/admin/remote-console-access.html

Putting it as Invalid since I don't really see a clear Nova issue, but
let's reopen the bug by marking it as "New" if you can explain more
what's the specific issue you have.

** Changed in: nova
       Status: New => Invalid

** Changed in: nova
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1741841

Title:
  VNC console fails to connect

Status in OpenStack Compute (nova):
  Invalid

Bug description:
  Description:
  When try to open an instance VNC console, we get an error message (such as "failed to connect server; code=1006) after some time.For the initial 5 min it work successfully.(pike release)

  Workaround: 
  browser refresh it eventually works.

  Logs:
  nova-consoleauth.log
  INFO nova.consoleauth.manager [req-0db1a667-bba0-427d-ba0b-4f03ecf1bcca - - - - -] Checking Token: f2c6eac1-ad7a-4bbf-8952-7e7fd5c4ae75, False

  nova-novncproxy.log
  INFO nova.console.websocketproxy [req-0db1a667-bba0-427d-ba0b-4f03ecf1bcca - - - - -] handler exception: The token 'f2c6eac1-ad7a-4bbf-8952-7e7fd5c4ae75' is invalid or has expired

  Environment
  -3 compute nodes and 2 controller nodes 
  -nova.conf on compute node has,
   vnc_enabled = True
   novnc_enabled = True
   vnc_keymap = en-us
   vncserver_listen = 0.0.0.0
   vncserver_proxyclient_address = 10.20.0.137
   novncproxy_base_url = http://10.20.3.101:6080/vnc_auto.html

  -nova.conf on controller node has [cache] section
   [cache]
   enabled = true
   backend = oslo_cache.memcache_pool
   memcache_servers = 10.20.0.142:11211,10.20.0.164:11211,10.20.0.152:11211

  Steps to reproduce 
  login to the dashboard as a project user, spawn a VM, from the drop down - select VNC console. Able to connect to vnc console for initial 5-7 min after this not able to connect.An empty VNC window appears but cannot connect to the VM with an error "Failed to connect to server(code:1006)".
  100% repeatable

  any guidance on resolve this would be really appreciated

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