There will be a maintenance regarding "Single Sign-On" system by
which logging in to "Common Portal for All students","Kyoto University
faculty and Staff Groupware" and so on.

http://www.iimc.kyoto-u.ac.jp/en/services/cert/sso/

Date and Time: June 20th between 18:00 and 20:00

The IP address will be changed as follows.
Before maintenance: 202.223.160.134
After maintenance: 133.3.254.163

Influence: The Single Sign-On service will not be suspended.
However, in some systems which use Single Sign-on, you may not
login temporarily.

System in which problems may arise: Safety Confirmation System
In this case, please reboot a computer and try your login again after a while.