The minimum length of a username in a Red Hat Network (RHN) Satellite defaults to five characters. In some organizations this may not be appropriate and the minimum or maximum username length may need to be changed.
/etc/rhn/rhn.conf and add the lines, as needed:
web.min_user_len = 3 web.max_user_len = 30
Save the file and as the root user, run the command:
service rhn-satellite restart