Can you provide the kernel output right after trying to access the
machine? Eg, on the system with ufw, do:

$ grep -i ufw /var/log/kern.log

or if you have redirected ufw output to go to another log file, attach
that logfile (eg, /var/log/ufw.log).

** Changed in: ufw (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1443203

Title:
  GUFW blocks all incoming VNC connections even if rules allow

Status in ufw package in Ubuntu:
  Incomplete

Bug description:
  I am having a problem with GUFW.  I have it set to block incoming
  connections from everything.  I then set rules to allow incoming
  connections from a VNC client on my local network to a VMWare Player
  VNC setup but no matter what I do with those rules, I cannot connect
  to the VNC server on my machine unless I change the setting for my
  profile to Allow for everything.  Making and applying rules has no
  effect if the "Incoming" setting at the top of the application is set
  to Deny or Reject.

  The only other option is to turn off the firewall entirely for a
  moment for the VNC client to connect, and then turn it back on again
  once a connection is established.  Allowing all incoming connections
  for even a few moments just to use VNC on one port is a security risk.

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