After reviewing the situation, we have decided to set up movement restrictions so characters can only enter the Firmament on their Home World. This will not require a maintenance and we are planning to implement this in real time on all Worlds.
Please read the following post for more details.
After the implementation of the restrictions, any characters who are already in the Firmament will encounter these when they try to re-enter the Firmament. Please continue to participate in the Ishgardian Restoration on your Home World.
We thank for your understanding and continuous support.