Hack Tool Repository

The toolset provided by Openssl offers the simplest way to test whether a server allows for client-side renegotiation in the established tunnel.

Note: This doesn't necessarily mean that the application beneath is vulnerable to attacks over this channel, but indicates the server allows attacks to happen.

Generic Example
Openssl s_client -connect yourserver.com:443
R (Triggers renegotiation - if this works, the server accepts renegotiations within an existing TLS session Requirement)
GET /clientcontrolled.html http\1.0