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Level 10

Proxy Returns SSL Handshake Failed before Client Hello after ~150ms

We have a group working with an AWS service that we haven't used before (though many others are in use), and it just can't seem to get off the ground.

We've resorted to packet traces for understanding the breakdown.

Here's a summary:

  1. Client establishes socket to MWG (syn, syn/ack, ack).
  2. Client requests: POST HTTP/1.1  (application/x-amz-json-1.0)
  3. Proxy ack to client.
  4. About 150ms later, proxy establishes socket to distant server (syn, syn/ack, ack).
  5. Immediately following this (<1ms), the proxy sends the client a status 500, handshakefailed, along with the error page for "SSL Handshake failed".
  6. Remaining packets moot.

The thing is, there is no SSL inspection/intercept.

AWS support says that packet traces on working systems show the Client Hello going out about 180ms after the socket is established.

All of the proxy timeouts in the configuration are 10 seconds or more.

Is there a setting we need to know about here--a hidden timeout for SSL/TLS that applies when there is no SSL inspection/intercept?

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2 Replies
Level 12

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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McAfee Employee

Re: Proxy Returns SSL Handshake Failed before Client Hello after ~150ms

If there is no SSL interception, I dont think we'd sent a handshake failure back to the client.

I'm guessing that MWG might be performing the handshake instead of the client (this happens you hit the "Enable cert verification" was enabled).

Have you tried a client IP bypass at the very top of the rules as a test?

Best Regards,


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