Hi Akrem.
Welcome to the forums. Those who post here are for the most part just volunteers (e.g. other Fortinet customers). If you are seeking professional help (technical support) and have a valid subscription on your 60E, you can log into the support portal (support.fortinet.com) and open a ticket there.
That said, if you would like our feedback/assistance with this issue, we will require more information. What have you did so far to troubleshooting it? The error message could indicate any number of issues.
Do you get the same error when using different web browsers?
Does the problem still happen when using different machines (or mobile devices)?
Do you get the same or similar error message when attempting to access other websites (especially on HTTPS)?
On the fgt have you checked FortiView, the web filter or other logs to for error messages related to the site?
What other options do you have set up on the firewall rule covering your web traffic? Can you post a screen grab of the firewall policy rule (san any identifiable info)?
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