From this address, you can connect to our Srdnlen Command Shell. But it only communicates with its own custom protocol, the specifications of which have never been published. Fortunately, this software and its protocol are very verbose, so by testing it and looking closely at the error messages, you can figure out how to communicate with our shell and retrieve all its secrets.
This is a remote challenge, you can connect to the service with: nc protoshell.challs.srdnlen.it 2178
Authors: @church