One of the Central Authentication Service (CAS) application servers had connection issue to back-end database server starting around 1:38 p.m. on April 14. This prevented some users who were on this server from logging in. This server has been restarted at 2:20 p.m. and CAS service has returned to normal. CCS technical team is investigating the root cause.
Update Tuesday April 14 at 5:19 PM.
The issue has been traced to a network issue between our datacentre firewall and a network switch. While the severity of the issue has not always been consistent issues were observed at the following dates and times:
Monday April 13:
Tuesday April 14:
CCS has made changes to reduce the probability of further disruptions and is working with our firewall and network vendors to fully resolve the issue.
Update Wednesday April 15 at 10:00 AM.
Two more instances noticed at:
At 9:12 IT security team switched the traffic to go through the standby datacentre firewall
We apologize for the inconvenience this has caused.
– Computing and Communications Services