[squid-users] WARNING: Forwarding loop detected for: blah...

I wonder if I am doing something wrong here or this is just a normal error
message.

I have one proxy at 217.21.68.4(proxy2) as parent and another at
217.21.68.52(turkey) as sibling.

So, the parent shouldnt fetch data from the sibling unless it already has
the data cached, right? So how come I see an error message in the sibling
cache that the parent cache was asking the data from the sibling which the
sibling asked from the parent at first place?

This occurs very rarely, like few times in few thousand requests. So I
wonder if this is a kind of synchronization problem or ?

cache.log from cache1
--------------------------------------------------------------------------------------
2004/02/11 08:18:58| WARNING: Forwarding loop detected for:
GET /windows/ie_intl/tr/download/default.htm HTTP/1.0
If-Modified-Since: Fri, 17 Jan 2003 16:16:58 GMT
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg,
application/vnd.ms-powerpoint, application/vnd.ms-excel,
application/msword, application/x-shockwave-flash, */*
Accept-Language: tr
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 5.0; Windows 98; DigExt)
Host: www.microsoft.com
Via: 1.1 turkey.ispro.net.tr:8080 (squid/2.5.STABLE4-20040210), 1.0
proxy2.ispro.net.tr:8080 (squid/2.5.STABLE4-20031225)
X-Forwarded-For: 217.21.68.195, 217.21.68.4
Cache-Control: max-age=259200, only-if-cached
Proxy-Connection: keep-alive
--------------------------------------------------------------------------------------

squid.conf from cache1 about neighbours
--------------------------------------------------------------------------------------
cache_peer 217.21.68.52 parent 8080 3130 default no-query no-netdb-exchange
nonhierarchical_direct off
minimum_direct_hops 1
minimum_direct_rtt 1
--------------------------------------------------------------------------------------

squid.conf from cache2 about neighbours
--------------------------------------------------------------------------------------
cache_peer 217.21.68.4 sibling 8080 3130 proxy-only no-netdb-exchange
--------------------------------------------------------------------------------------
Received on Tue Feb 10 2004 - 23:35:30 MST