- Occurred: 2018-12-07 approximately 21:00
- 2018-12-07 12:00 [UTC]
- Recovered: 2018-12-08 approximately 18:00
- 2018-12-08 9:00 [UTC] (approximately 21 hours period)
During the period specified above, it became unable to connect due to a certificate validation error when trying to connect to Questetra from some client environment such as Java 8u77 or earlier or Java 7u99 or earlier.
Cause of Trouble
In the periodic server certificate update work, we changed the root certificate on the certification path from DigiCert Global Root CA that uses SHA-1 to DigiCert Global Root G2 which uses SHA-256, in order to improve security. As the result, DigiCert Global Root G2 cannot be connected from a client environment that is not registered in the trust store.
Recovery by switching back to the previous certificate (DigiCert Global Root CA)
(Please see Maintenance page for the details of the server certificate updating work.