Due to several known issues, we did not recommend the use of FortiOS 6.2 in productive environments for the first couple of months. As per FortiOS 6.2.5, we noticed that most of the issues have been resolved. Please have a look into our FortiOS upgrade guide for the upgrade procedure.
Recently we have had a few support cases where a customer was unable to log in to the firewall via WebUI after the firmware update. But SSH access worked fine. It turned out that during the update process the server certificate used for the WebUI is lost. Config with v6.0.4…
Last week Fortinet has released a critical PSIRT-Advisory “Improper check for certificate revocation vulnerability” Unfortunately the article does not give exact information regarding the background or the solution and we couldn’t find further information about the issue, either. Maybe you have more information?
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