Users do not receive UserCheck page for blocked HTTPS content

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Technical Level

Solution ID	sk93184
Technical Level
Product	HTTPS Inspection
Version	R75 (EOL), R76 (EOL), R77 (EOL), R77.10 (EOL), R77.20, R77.30 (EOL)
Platform / Model	All
Date Created	22-Dec-2013
Last Modified	17-May-2017

Symptoms

User receives "Unreachable" message instead of a UserCheck page, when HTTPS Inspection is enabled and the gateway is configured as a proxy or the gateway is located between a client and a proxy.

Cause

When HTTPS connection is tunneled through HTTP proxy, the client sends HTTP "CONNECT" request as a first message.

If the gateway tries to reply with UserCheck redirect to such message, the result will be: the "Unreachable" message in browser. This happen cause most browsers are not supporting redirect reply on CONNECT request.

Solution

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