As per the FAQ, the claims system has been disabled until the trustee is ready to accept claims again: "Further, due to the stay of the bankruptcy proceedings,

As per the FAQ, the claims system has been disabled until the trustee is ready to accept claims again: "Further, due to the stay of the bankruptcy proceedings, MTGOX bankruptcy claims filling system (the “System”), which was being provided on its website, has been temporarily suspended. As in the bankruptcy proceedings, the Civil Rehabilitation Trustee is expected to accept the method of filing a proof of rehabilitation claim through the System in the Civil Rehabilitation Proceedings as well. Therefore, please take note of your user name and password registered on the System." [1] https://www.mtgox.com/img/pdf/20180622_announcement_en.pdf https://www.mtgox.com/img/pdf/20180622_announcement_en.pdf