WARNING: Forwarding loop detected

I am receiving lots of the following errors in the cache.log file. We are running Squid1.1.5 on an alpha OSF1 v3.0
> I am receiving the following error running Squid1.1.5 (alpha OSF1 v3.0) in the
97/01/28 15:23:15| WARNING: Forwarding loop detected for
'http://www.sas.com/service/doc/pubcat/uspubcat/master.html'
97/01/28 15:23:15| --> 1.0 celebrian.otago.ac.nz:81 (Squid/1.1.5)
 
 Does any-one know what the problem could be?

-- 
Raewyn Brundell					raewyn@elwing.otago.ac.nz
Systems Support Specialist                      webmaster@www.otago.ac.nz
Information Technology Services		             phone +64 3 479-8539
University of Otago                                  fax   +64 3 479-8577
P.O. Box 56
Dunedin
New Zealand
"If people concentrated on the really important things in life, there'd
be a shortage of fishing poles."