up2date failing to connect to RHN

[Steven Stromer <filter stevenstromer com>]

My RHN up2date icon has suddenly decided to become a greyed out question 
mark. It is generating the error:

Error: <ProtocolError for xmlrpc.rhn.redhat.com/APPLET:502 Proxy Error>

I do not run a proxy. I understand that accidentally selecting 
'register' when asked may cause the greyed out icon symptom, but I can 
find no better information than this. If anyone can give assistance, I'd 
appreciate it!

Steven Stromer