Netgear STM150 User Manual Page 228

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Content Filtering and Optimizing Scans
228
ProSecure Unified Threat Management (UTM) Appliance
Configure HTTPS Scanning and SSL Certificates
How HTTPS Scanning Works
Configure the HTTPS Scan Settings
Manage SSL Certificates for HTTPS Scanning
Specify Trusted Hosts for HTTPS Scanning
Configure the SSL Settings for HTTPS Scanning
How HTTPS Scanning Works
HTTPS traffic is encrypted traffic that cannot be scanned or the data stream would not be
secure. However, the UTM can scan HTTPS traffic that is transmitted through an HTTP
proxy. The UTM can break up the SSL connection between the HTTPS server and the HTTP
client, scan the HTTPS traffic, and then rebuild the SSL connection. The following figure
shows the HTTPS scanning traffic flow.
Figure 123.
The HTTPS scanning process functions with the following principles:
The UTM breaks up an SSL connection between an HTTPS server and an HTTP client in
two parts:
- A connection between the HTTPS client and the UTM
- A connection between the UTM and the HTTPS server
The UTM simulates the HTTPS server communication to the HTTPS client, including the
SSL negotiation, certificate exchange, and certificate authentication. In effect, the UTM
functions as the HTTPS server for the HTTPS client.
The UTM simulates the HTTPS client communication to the HTTPS server, including the
SSL negotiation, certificate exchange, and certificate authentication. In effect, the UTM
functions as the HTTPS client for the HTTPS server.
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