Hi Phillip,
I assume you mean this section:

host:d
TCP connections will only be allowed from host on display d.  By convention the 
TCP port is 5900+d. Optionally, host can be omitted in which case the server 
will accept connections from any host.

It does in fact work as the man page says, you need to know that the
base address for vnc is 5900, so setting just colon<number> sets
5900+<number> and in fact binds to all IP.

Example:
$ qemu-system-x86_64 -vnc :7

Then from netstat -eeapn:
tcp        0      0 0.0.0.0:5907            0.0.0.0:*               LISTEN      
1000       2613239    29113/qemu-system-x

You see it is bound on 0.0.0.0:5907 from 0.0.0.0:*, which seems exactly
what the man page talks about.

Does it behave differently for you?

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

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https://bugs.launchpad.net/bugs/1787270

Title:
  vnc won't accept remote connections

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