I get the occasional message from students who say they can't access the
login page on our servers. Their messages usually indicate that they can
browse other internet sites and even ones on our campus, but that when they
try to go to one of the loncapa servers they get a screen something like

"We can't find	"http://lewis.chem.sfu.ca/adm/roles"
Error -  Request forbidden"

Anybody know what might be the most likely cause/solution for their problem?

Local firewall or security settings? 
Something obvious that I am overlooking?

