Skype for Business does not work when HTTPS inspection is enabled and the Security Gateway is configured as a proxy

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Technical Level

Symptoms

Skype for Business does not work when HTTPS inspection is enabled and the Security Gateway is configured as a proxy.

Cause

The Host header in a HTTP/1.1 request is presented in mixed case. This is is not limited only to Skype for Business.

The issue might occur in both non-transparent and transparent proxy implementations.

Solution

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