|Thanks Wanderer & Paulsep|
Yepp, indead, there isn't any open port, you mentioned above.
But you should check, whether your router, if you're using one, has web administration enabled.
Depending on the router you're using, it might have an build in FTP server for e.g. ftp access to an possibly attached USB drive
Paul I don't understand what do I set in the router or do I just leave it alone, if it's safe.