Technical Tip: How to resolve certificate error pop-up seen in Outlook for 'autodiscover.outlook.com'

[kmohan]

Description	This article describes how to troubleshoot the Outlook security risk pop-up issues.
Scope	FortiGate V6.4.x and above.
Solution	The following pop-up in Outlook appears intermittently: This is probably because FortiGate blocked that site, and Outlook is complaining about the block page having an untrusted certificate.  The best remediation would be to look in the Security Event logs to see why that site was blocked in the first place. If using Deep Inspection, this error may be expected if the CA certificate is not installed on the PC. Follow this article to import the CA certificate onto the PC: Technical Tip: How to enable deep inspection and import a certificate in the browser