Cisco Cisco Web Security Appliance S690 User Guide

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AsyncOS 8.5 for Cisco Web Security Appliances User Guide
 
Chapter 6      Classify End-Users and Client Software
  Identities and Authentication
Identities and Authentication 
 shows how the Web Proxy evaluates a client request against the Identities when 
the Identity is configured to use:
No authentication surrogates
IP addresses as authentication surrogates
Cookies as authentication surrogates with transparent requests
Cookies as authentication surrogates with explicit requests and credential encryption is enabled
Figure 6-1
Transaction Request flow: Identities and Authentication - No Surrogates and IP-Based 
Surrogates