IIS 6 odd 404 entries

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Hi,
We have recently added our own 404 & 500 error pages to IIS6 which writes errors to SQL database then posts an email to me to help resolve any them quickly. Can anyone explain why I am seeing errors in this log from other peoples websites, the 404 trigger should only occur when someone tries to access pages within my site shouldnt it?

For example the below is a 404 on my IIS that has nothing to do with our site/domain and with no outbound web access from the IIS server it baffles me..

Referrer:
http://www.currys.co.uk/martprd/sto...ory_oid=-11107&fm=2&sm=undefined&tm=undefined

File: http://store_doc:80/images/GE_Images/audio/dotted_arrow_blue.gif

Confused..

 

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I do believe he's been answered elsewhere. I Googled his question and came up with a very recent entry in one of the MS mailing lists in which someone with the same name and the exactly worded question was given an answer to this. It seems it's to do with a combination of factors, none serious.