neighbours not returning images?

Hello,

I am seeing a strage effect where if a request is made to the proxy for
an image file that a neighbour has, the proxy returns an error 61
(Connection refused) despite the fact that the neighbour appears to
believe it has delivered the item and direct access (without proxy) is
successful.

I am running squid/1.0.16 on both proxies. They are Alphas running DUX
4.0. I have 100M memory free on each system, so resources are not a
problem. They are set up as proxy-only neighbours, with no other parents
or friends. I have only been able to see/duplicate this for image files
(gif and jpg) so far.

Log details below. Does anyone have any ideas as to what may be going
wrong ?

On PROXY1 the access log returns:
access.log:130.102.128.96 - - [30/Sep/1996:14:38:38 +1000] "GET
http://www.unitedmedia.com/comics/dilbert/archive/dilbert960911-4053.gif"
ERR_CONNECT_FAIL 945

But the hierarchy log seems to indicate that the neighbour did offer the
object:
hierarchy.log:[30/Sep/1996:14:38:38 +1000]
http://www.unitedmedia.com/comics/dilbert/archive/dilbert960911-4053.gif
NEIGHBOR_HIT lyrebird.cc.uq.oz.au

store.log:844058318.365 RELEASE 400 300 [ 5m] 0/945
1285/GET/http://www.unitedmedia.com/comics/dilbert/archive/dilbert960911-4053.gif

PROXY2 appears to log a sucessful hit:
access.log:130.102.2.60 - - [30/Sep/1996:14:38:38 +1000] "ICP_QUERY
http://www.unitedmedia.com/comics/dilbert/archive/dilbert960911-4053.gif"
UDP_HIT 93

Use of the reload button fetches this item without any difficulty
whatsoever.
---------------------------------------------------------------------
Julianne Weekers (J.Weekers@cc.uq.edu.au)
                            Prentice Centre, University of Queensland
                            ph(07-33654404) fax(07-33654477)
Received on Sun Sep 29 1996 - 23:39:53 MDT