See server logs, all TLS-related errors will be logged there, as well as successful TCP connections that send
at least some data.
"Connection reset" is unambiguous, however: the server rejected TCP connection (e.g. it's not listening
on port 5671).
Setting up certificate, key and so on via URI is not currently supported by PerfTest (or Java client it uses, IIRC).
TLS per se should be enabled for "amqps" URIs, though.
You can use PerfTest as a library in case your server under test cannot accept certificateless clients.