How to display custom error message for xinetd based vnc connection failure?

Issue

• We have configured xinetd based vnc service with per_source limit.

service Xvnc
{
  disable = no
  flags = IPV4
  flags = IPv4
  socket_type = stream
  protocol = tcp
  per_source = 5
  wait = no
  user = nobody
  server = /usr/bin/Xvnc
  server_args = -inetd -once -query localhost -SecurityTypes=VeNCrypt,TLSnone -geometry 1280x1024 -depth 24 -extension XFIXES
}

• The connection is not allowed when user tries to connect beyond 5 sessions, which is obvious.
• There should be some way to convey relevant message to the user attempting connection beyond set limit.
• Is there any way to display custom message to user when vnc connection fails beyond per_source limit?