When launching gzclient on a VPN produces the following:

ROS Kinetic and Melodic

[Wrn] [GuiIface.cc:297] Couldn't locate specified .ini. Creating file at "/root/.gazebo/gui.ini"
Exception sending a message
Exception sending a message
Exception sending a message
....

ROS Dashing

[gzclient   -2] Exception sending a message

A workaround is export IGN_IP=127.0.0.1. Could it possibly be a bug?

Version: Gazebo 9

Distribution: ROS Kinetic, Melodic and Dashing