Using cert auth results in `SSL alert number 46`

[josh-hemphill]

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Whenever I set my server to cert-auth require, the node-http-proxy acting as the client fails with: D0340000:error:0A000416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown:C:\ws\deps\openssl\openssl\ssl\record\rec_layer_s3.c:1586:SSL alert number 46

I'm using the following in my config to set client cert for auth:

config = {
  target: 'some target url',
  secure: false,
  followRedirects: true,
  ssl:{
    pfx:[{
        buf: readFileSync('somefile'),
        passphrase:"some passphrase"
      }]
  }
}

I've made sure other clients can connect to my server directly just fine with client cert auth, it only seems to be an issue with node-http-proxy