Hello,
This is the RO1 Studio Ragnarok Online: ZERO Team.
We apologize for the inconvenience caused.
We have identified an issue with unstable connections on the 
Mjolnir server and have taken action to resolve it.
The server is currently accessible.
However, if a large number of users attempt to connect at the same time, connection delays may occur.
If you experience a connection delay, please try reconnecting after about 1 minute.
If any additional issues are identified, we will inform you through a notice,
and we plan to continue the test service.
We apologize again for the inconvenience.
Thank you.
Gravity Co., Ltd. RO1 Studio Ragnarok Online: ZERO Team