<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:11px">Our R16A testing uncovered a possible problem with client connections with client certificate.</span><div style="font-family:arial,sans-serif;font-size:11px">
<br></div><div style="font-family:arial,sans-serif;font-size:11px">Our app hits an entrypoint under <a href="https://sn1.mpns.live.net/" target="_blank">https://sn1.mpns.live.net</a> which is apparently running IIS/7.5. The initial handshake succeeds and our request is sent, but this triggers a renegotiate with client certificate request. The second handshake succeeds on R15B01, but the server immediately closes the connection at some point during the second handshake on R16A.</div>
<div style="font-family:arial,sans-serif;font-size:11px"><br></div><div style="font-family:arial,sans-serif;font-size:11px">I narrowed the problem down to the commit which changed the default to TLS v1.2. Adding {versions, [tlsv1, sslv3]} to the ssl options allows the request to succeed on R16A.</div>
<div style="font-family:arial,sans-serif;font-size:11px"><br></div><div style="font-family:arial,sans-serif;font-size:11px">I suppose this could be a bug on the IIS side. I can't tell.</div><div style="font-family:arial,sans-serif;font-size:11px">
<br></div><div style="font-family:arial,sans-serif;font-size:11px">Rr</div></div>