> Java 1.8.0_131
> Both servers on same machine, using same Java
> Source server is using async-http-client 1.9.18
> Destination server is using Jetty 9.4.7.v20170914

....

> New I/O worker #10, WRITE: TLSv1.2 Handshake, length = 161
> [write] MD5 and SHA1 hashes:  len = 140
> 0000: 01 03 03 00 63 00 00 00   20 00 C0 23 00 C0 27 00 ....c... ..#..'.
> ...
> 0080: 07 06 BB A0 AB 39 66 80   95 55 14 65 .....9f..U.e
> New I/O worker #10, WRITE: SSLv2 client hello message, length = 140

It looks like the async-http-client is sending a SSLv2 client hello message during the handshake and I'm guessing Jetty doesn't support (or maybe has disabled) SSLv2Hello handshake messages. What SSL protocols have you enabled on both these sides? If you haven't explicitly enabled any, then what do they default to in these libraries/servers?

-Jaikiran

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