During SSL/TLS negotiation, Twilio experienced a connection reset.
Possible Causes
Incompatible cipher suites in use by the client and the server. This would require the client to use (or enable) a cipher suite that is supported by the server.
Possible Solutions
Verify cipher suites in-use are up to date. Twilio-supported ciphers can be found here
Use compatible version of TLS, Twilio supports TLS 1.2.