Online music retailer CDNow imposed a block on a large group of Telstra and TelstraClear internet addresses this week, meaning customers of TelstraClear ISP Paradise Net could not contact the CDNow site.
They were presented with a largely blank page carrying only the message “you are forbidden”.
CDNow customers using other ISPs were experiencing no problems with the site.
CDNow had apparently detected undesirable traffic coming from a Telstra address, says TelstraClear spokesman Mathew Bolland. “We’re assuming it was spam”. The company then imposed the wide-ranging block, which was in place for several days.
The offending address was actually that of a cache, so TelstraClear tackled the problem by bypassing its cache for users accessing CDNow, so the troublesome source was identified more directly, and the scope of the block could be reduced to the problem user alone, says technician Peter Ambrose.
"CDNow did not advise us before putting on the block, and we are discussing the matter with them now", he said on Wednesday.
This was a one-off exercise for the CDNow problem, and will not result in any broader changes to TelstraClear ISPs, he says.
When the Paradise helpdesk was initially asked by email “are they [CDNow] blocking you or are you blocking them?” a helpdesk staffer replied: “As far as Paradise.net is concerned we don't show much interest in what sites you go to. But I tried myself the address www.CDNow.com and got the same message”.