Customers of online bank Egg were hit with site access problems from the evening of Wednesday 22 August after Egg's network provider Cable & Wireless suffered an outage.
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The problems went well into Thursday 23 August, with web analytics firm Keynote reporting that customers suffered long web waits before "being thrown into search engines or a blank page".
Cable & Wireless said it was re-routing Egg customers across its networks to help them avoid the undisclosed technology problems.
The egg.com site is now working normally. The bank was recently taken over by Citigroup.