Effective December 17, 2025, the intermediate CA used to issue RSA server certificates will be transitioned to a new root CA.
If you obtain or renew a server certificate on or after December 17, 2025, please ensure that you use the new intermediate certificate available at the URL below(file name: nii-odca4g8rsa-pem.cer).
https://repo1.secomtrust.net/sppca/nii/odca4/index.html
In addition to the intermediate certificate, installation of the corresponding cross-root certificate is also required(file name: tlsrsarootca2024cross-pem.cer).
Please refer to the following URL and install both certificates accordingly.
https://certs.nii.ac.jp/news/20251112-0
If you have any questions and concerns, please access our online form
https://helpdesk.cis.kit.ac.jp/
and make an inquiry via the link “Get assistance for general IT problems and questions”.