Users outside of the Computing Facilities Management Project may not change, nor attempt to change, any system or configuration files on computing resources covered by this document, unless specific arrangements have been made in advance with the Computing Security Manager. Password control of access to machines is crucial to protecting the site computing environment. Sharing of a password amongst people is inappropriate. Passwords must not be written down and kept anywhere in the vicinity of computing resources. Assistance on selecting passwords, when to change them, and which machines ought to have different passwords on a given account, is available from the Computing Security Manager.
Physical security is handled by keeping doors locked out of normal hours.
All users should challenge anyone they do not recognize. However, there are still people flowing through, often without escort. Users must log out when they plan to leave for long periods. Networked machine access is, in general, restricted to the telnet, X, ftp, and http protocols only. Certain research groups work with additional protocols.