Firesight URL filtering - shows do not block page for https sites

Hi all

I configured to block certain pages of URL filtering. I configured the decrypting ssl as well. But I noticed that when a website https is blocked firesight does not display the block page. When the Web http site is blocked the block page shows correctly. Is this a limitation in the firesight?. The firesight version is 6.0.

Thanks in advance

Ophelia

SSL web filtering occurs with the common name of the server certificate. When the end user opens any SSL-based Web site. End system not the TCP connection with the server and then SSL handshake begins.

The probe monitors the SSL handshake and when the server sends the server certificate. Sensor corresponds to the common name of the certificate with the access rule (rules based on a URL). If it matches the sensor blocks the connection during the SSL handshake. Therefore, the connection has been blocked before reaching the application protocol (HTTP GET request) so that the system doesn't send any response page.

The sensor not the resignation certificate (SSL decryption) when it receives the certificate of the server, but at the same time / name common package (server certificate) corresponds to the access rule (URL blocking) to block the connection. Therefore, blocking connection has occurred then the SSL decryption is not the case. In this way, the system can save some resources (CPU / memory).

Kind regards

Sunil Kumar

Rate if that helps!

Tags: Cisco Security

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