Trusted root certificate being automatically removed from store
Doing more thorough digging in the Application event log, this entry occured:
Log Name: Application Source: Microsoft-Windows-CAPI2 Date: 24/10/2014 12:49:10 Event ID: 4108 Task Category: None Level: Information Keywords: Classic User: N/A Computer: [redacted] Description: Successful auto delete of third-party root certificate:: Subject [...redacted...]
It turns out that 3rd party root CA's can be deleted by Windows if they are not recognised:
Typically, a certificate is used when you use a secure Web site or when you send and receive secure e-mail. Anyone can issue certificates, but to have transactions that are as secure as possible, certificates must be issued by a trusted certificate authority (CA). Microsoft has included a list in Windows XP and other products of companies and organizations that it considers trusted authorities.