I'm trying to solve an online challenge. I've got a server address and a private RSA key, both of which I'm giving to Putty (I'm using Windows, the server is running OpenSSH on Ubuntu). I've managed to connect using a passphrase I've found and a user name which I've guessed. However, as soon as I'm giving Putty the username and the RSA passphrase, the server is responding with:
/bin/false: File not found
And closes the connection immediately.
Is it possible that the same private key can be used with a different username which will have a different home directory (hopefully)?
Is there a way to change the default home directory during the connection negotiation?
I also have read only access to an FTP server which is served from the same IP address, however I didn't find (or don't have permissions to) any SSH config files sitting there (the FTP server is where I found the private RSA key)
Anyway, any advice is of course appreciated. I've been banging my head against the wall for the past 2 days trying to solve this.