I've had problems with vncserver and IPv6 before, and since I don't use IPv6 yet…
echo net.ipv6.conf.all.disable_ipv6=1 > /etc/sysctl.d/disableipv6.conf
# ou
sysctl net.ipv6.conf.default.disable_ipv6
This command will disable IPv6 on the next boot. You'll also need to comment out the IPv6 entries in the /etc/hosts file.

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