Why vnc service failed with "A vnc server is already running on :N" despite there is no vnc service running?

Solution Verified - Updated -

Issue

  • Why vncserver@:1.service is not starting on the system?
  • Why is vncserver able to start on :2 display but not on :1, vncserver@:n.service failed with A vnc server is already running on :N

Environment

  • Red Hat Enterprise Linux
  • Tigervnc

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