SSHelper Server not reachable SSHelper SSH server works very nice on my old Samsung S2. But it does not work on a newer device of my son.

I installed no firewall on the new device. Is there some restriction which does not allow running a server on the android device? 

I can't reach the port 2222 and I can't get the device to answer ping requests.

For me SSHelper is the most simple way to transfer files between my linux desktop and the mobile phone.
sshelper works great on my Samsung S5.

In sshelper under the wrench icon you can increase the verbosity of the data logging mode, try increasing that and then pointing your browser to the listed 'ssh server address' and append the 'log server port number' (default :8080).  This might give you a clue as to why your having issues.