Re: Proxy Returns SSL Handshake Failed before Client Hello after ~150ms
open a SR with McAfee about the SSL handshake error. They will certainly require a Rule Engine Trace (see here) and Connection Tracing (GUI->Configuration->Troubleshooting->Enable Connection Tracing, results are at GUI->Troubleshooting->Connection Tracing).
Typically, you'll get a technically sound answer quite fast from them.
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