A free calls scam has been ended after a British teenager published a guide to the hack on his web page.
Hackers used a loophole in Microsoft's Internet Connection Wizard to make unlimited free calls to ISP UUNET. They reconfigured part of the Windows 95 program to connect via the freephone 0800 numbers UUNET offers for first-time users to register - so the facility could be used all the time.
When an 18-year-old Essex hacker published a step-by-step guide to the hack within an electronic magazine on his home page, the free ride ended.
Security officials at UUNET read the guide and stopped the fraud.
"We have now closed this loophole," said UUNET spokesperson Lysa Ratliff.
The hackers had been active for months. Ratliff denied the ISP had lost hundreds of thousands of pounds to 200 hackers, putting the losses at around #100.
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