Several thousand Telewest broadband customers were hit by service problems on Monday, extending intermittently through Tuesday night, according to the company, which is part of the ntl: Telewest group.
The problem hit customers of Blueyonder, Telewest's cable-based broadband ISP, the company said. A management issue meant that customers with newly assigned IP addresses experienced disruption starting on Monday afternoon and extending, for some customers, through Tuesday morning.
Those affected included new customers and those who required a new dynamically-assigned IP address during the period of disruption - for example customers who restarted their modems.
"The problem affected two to three thousand customers nationwide," said Telewest spokesman John Moorwood.
"It started Monday and we had isolated instances of it yesterday too," Moorwood said on Wednesday. "Today there appear to be a few customers in the Preston region still affected."
Telewest is part of the ntl: Telewest group, which also recently completed the acquisition of Virgin Mobile.
In recent months broadband operators have seen a crush of interest in packages bundling services such as television, telephone and mobile services along with internet connectivity, resulting in service problems for some operators.
In November, a survey from uSwitch.com found that broadband bundle providers TalkTalk and Orange ranked at the bottom of a customer satisfaction survey, with less than half of their respective users saying they were happy with service. NTL and Tiscali had satisfaction rates of just over 50 percent.
Customer satisfaction rates for the top 10 broadband providers fell by 9 percent last year, uSwitch.com said.