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I am trying to set up remote desktop into a Centos6 distribution with gdm. This is my configuration file /etc/gdm/custom.conf

[root@localhost ~]# cat /etc/gdm/custom.conf
# GDM configuration storage
[daemon]
[security]
AllowRemoteRoot=true
DisallowTCP=false
[xdmcp]
Enable=true
[greeter]
[chooser]
[debug]

I have enable the ipv6 on my box as follow.

[root@localhost ~]# sysctl -a|grep disable_ipv6
net.ipv6.conf.all.disable_ipv6 = 0
net.ipv6.conf.default.disable_ipv6 = 0
net.ipv6.conf.lo.disable_ipv6 = 0
net.ipv6.conf.eth0.disable_ipv6 = 0
net.ipv6.conf.eth1.disable_ipv6 = 0
net.ipv6.bindv6only = 0

This is my gdm'version.

[root@localhost ~]# gdm-binary --version
GDM 2.30.4

This is my ipv6 route:

[root@localhost ~]# ip -6 route
unreachable ::/96 dev lo  metric 1024  error -113 mtu 65536
unreachable ::ffff:0.0.0.0/96 dev lo  metric 1024  error -113 mtu 65536
unreachable 2002:a00::/24 dev lo  metric 1024  error -113 mtu 65536
unreachable 2002:7f00::/24 dev lo  metric 1024  error -113 mtu 65536
unreachable 2002:a9fe::/32 dev lo  metric 1024  error -113 mtu 65536
unreachable 2002:ac10::/28 dev lo  metric 1024  error -113 mtu 65536
unreachable 2002:c0a8::/32 dev lo  metric 1024  error -113 mtu 65536
unreachable 2002:e000::/19 dev lo  metric 1024  error -113 mtu 65536
unreachable 3ffe:ffff::/32 dev lo  metric 1024  error -113 mtu 65536
fe80::/64 dev eth0  proto kernel  metric 256  mtu 1500

But I can only listen on port 177 via udp not udp6.

[root@localhost ~]# lsof -i:177
COMMAND    PID USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
gdm-binar 2166 root   11u  IPv4  16321      0t0  UDP *:xdmcp 

That is using udp4 and no udp6. I restart the services with sudo init 3; sudo unit 5, but nothing change. I have rebooted my box even, and still the same. Any idea how I can force xdcmp to be listening on UDP v6 and udp4?? Thanks in advance. Can anyone help me to solve this problem ?

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