3des-cbc is an insecure cipher. As such, you must explictly add it to Config in order to use it. Change-Id: Ifd15cde46a9908eefef1c75bae7e97b05767361d Reviewed-on: https://go-review.googlesource.com/22770 Reviewed-by: Han-Wen Nienhuys <hanwen@google.com> Run-TryBot: Han-Wen Nienhuys <hanwen@google.com>