These services and their ports will remain open for a very short period of time. It is strongly recommended that security shell login (SSH, SFTP and SCP) are used. As an additional note, Hopkins firewall has blocked telnet port, so you can not telnet into chow from home.
There are many clients that are free to download. (OpenSSH, Putty SSH, Win SCP, etc.)
http://www.math.jhu.edu/sshconnect (your browser must enable Java)