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itmdadmin
itmdadmin
New Member
September 13, 2024
Question

FortiOS 7.4.4 Web Filter didnt show replacment message (Blocked Page)

  • September 13, 2024
  • 3 replies
  • 2971 views

I have a foritgate 600E with fortios 7.4.4 used as a proxy, and I created a new proxy policy with web filter security porfile to blocked the webmail and instant message websites. It block the websites with the broswer's block message instead of the replacemnt message (Blocked Page) of the FortiOS for all https website.

Below is the case i have try:

1.  Web Filter Profile (Flow-Base) + SSL Certificate Inspeaction

2.  Web Filter Profile (Flow-Base) + Full SSL Inspeaction

3.  Web Filter Profile (Proxy-Base) + SSL Certificate Inspeaction

4.  Web Filter Profile (Proxy-Base) + Full SSL Inspeaction

 the CA cert of foritnet is installed in my computer and the replacement message of Application Control is wokring fine.

3 replies

ametkola
Staff
ametkola
Staff
September 13, 2024

Hello,

In this case FortiGate acts as web server and uses the Fortinet default certificate signed by Fortinet CA.To view that replacement message, you need to install the certificate on the host machine , clear the cache and test in different browsers to check the issue. 

 

Kind regards,

 

    itmdadmin
    itmdadminAuthor
    New Member
    September 16, 2024

     the CA cert of foritnet is installed in my computer and the replacement message of Application Control is wokring fine but it just not working with web filter

    nathan_h
    Staff & Editor
    nathan_h
    Staff & Editor
    September 14, 2024

    You can try to disable the blocking on the browser. It might be the browser already blocked it and the request didn't reach the Fortigate

      itmdadmin
      itmdadminAuthor
      New Member
      September 16, 2024

      No blocking is enabled and i had also tested in 3 different broswer ( Edge , Chrome and Firefox)  which return with same result 

      ametkola
      Staff
      ametkola
      Staff
      September 17, 2024

      Hello,

       

      When SSL deep inspection is enabled, a replacement message will appear depending on the protocol. For example, with HTTP2, the blocking is done in the SSL key exchange once
      the first server packet is delivered and replacement messages can not be displayed.So replacement message for https based applications may not be displayed for all at the same time
      FortiGate application control can block the traffic by resetting connection.

      Can you please try for the HTTP traffic and check the behaviour ?

       

      Kind regards,

       

        itmdadmin
        itmdadminAuthor
        New Member
        September 19, 2024

        HTTP website can show the replacement message 

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