Home >CU Link Self-Service System suspension due to system maintenance CU Link Self-Service System suspension due to system maintenance Due to system maintenance, CU Link Self-Service System (https://cloud.itsc.cuhk.edu.hk/CULINK-PIN/enquiry.aspx) will be out of service during the period (9:00-15:00 on 26 April). The affected services include: Check card default PIN Online CU Link loss reporting service For details, please visit: https://www.itsc.cuhk.edu.hk/newsdetails/firewall-upgrade-on-26-april/