I have an 8851 I upgraded to 11.0.1 and when I enter the Spark Activation Code I get "Server certificate validation failed" and the status logs shows "invalid server certifacte:idbroker.webex.com". anyone seen this and have a fix?
I have seen this error on earlier alpha versions of the firmware however never on the production version. This error is caused by the phone not being able to verify the certificate of the Spark Identity management system. (idbroker.webex.com)
This could be caused by a Man in the Middle HTTP proxy changing the certificate being presented by the spark service.
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This can be caused by an NTP issue. The cert for idbroker.webex.com has a validity start date of Thursday, April 9, 2015 at 8:00:00 PM Eastern Daylight Time, and without NTP the phones will have a time set some time in November 2015.
The phones have a fallback NTP server of "0.tandberg.pool.ntp.org" so you can check whether NTP is being blocked to that address.
The other option is to assign an NTP server via dhcp option 42.