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You're setting I:enableMoonPortals= to 0 in the PortalGun_world.cfg?(the file found in your /world folder)
If so, then you could try editing PortalGun.cfg in your /config folder.
Look for this code:
Code:
# Range of which you can shoot portals.
# Rounded off to nearest 5.
I:portalRange=66
}
This way, you can only shoot portals 'X' amount. I'm pretty sure the moon is farther away than what you would set.