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Description of problem:
When using xdmcp via Xephyr with IPv6 address the gdm does not show.

Version-Release number of selected component (if applicable):
gdm-40.1-18.el9.x86_64

How reproducible:
100%

Steps to Reproduce:
1. $ Xephyr :99 -query ::1
2.
3.

Actual results:
Black screen, empty journal with gdm debug set.

Expected results:
gdm login screen loads and journal has some data.

Additional info:
Following command works with no issues
$ Xephyr :99 -query localhost

When the command in reproducer is running long enough I get 'XDM: too many retransmissions, declaring session dead' in the console.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (gdm bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2278