When loading a website through the Web Gateway's SSL Decryption Proxy, default port of 8443, you get the error message:
The proxy server isn't responding
Many websites have removed support for TLS 1.0 due to recent vulnerabilities being published. The Web Gateway SSL Decryption Proxy prior to software versions 5.2.8 only support TLS 1.0, and not TLS 1.1 nor 1.2.
You can test the protocols a website supports at this website: https://cryptoreport.websecurity.symantec.com/checker/
Web Gateway version 5.2.8 adds support for TLS 1.1 and 1.2, in addition to TLS 1.0.
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