TLS fails reading self-signed certificate on node 4.2.5+ #5100

I'm having an issue with ssl certificate validation using the tls module. The server is started with:

tls.createServer({
        pfx: fs.readFileSync(config.certFile),
        passphrase: config.keyPass,
        requestCert: true, 
        rejectUnauthorized: false 
    }, ...);

The client:

tls.connect({
    port: config.port,
    host:config.host,
    pfx: fs.readFileSync(config.cert),
    passphrase: config.pass,
    rejectUnauthorized: false
});

My issue is that I get tlsSocket.authorizationError SELF_SIGNED_CERT_IN_CHAIN on v4.2.5+ but not on older versions. Here's my output on a Windows machine, but the same happens on an Ubuntu server.

>nodist 4.2.5
>node --version
v4.2.5

>node server.js
server started:
auth->SELF_SIGNED_CERT_IN_CHAIN

>nodist 4.2.4
nodev4.2.4

>node server.js
server started:
auth->null

The auth-> line is printed to console with the tlsSocket.authorizationError parameter when a client connects. In the case of a successful connect this field is null.
Tested down to 0.12.9, all versions read the certificate without issues.