A problem during routine maintenance has knocked millions of Time Warner Cable subscribers off Internet.
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A Time Warner Cable truck is viewed in Brooklyn on August 27, 2014 in New York City.
On Wednesday morning, an estimated 11 million subscribers were hit by the early morning outage, which lasted more than hour.

The company has said the problem affected all of its markets and started at 4:30 a.m. and was largely restored by 6 a.m.

Time Warner Cable has about 11.4 million high-speed data subscribers in 29 states nationwide.

"During an overnight network maintenance activity in which we were managing IP addresses, an erroneous configuration was propagated throughout our national backbone, resulting in a network outage," the company has said in a statement.

"We immediately identified and corrected the root cause of the issue and restored service by 7:30 am ET (Eastern Time).

"We apologize for any inconvenience this caused our customers. A failure of this size is very serious and we are taking the necessary steps to improve our processes with the objective of making sure this doesn't happen again."

The outage sparked widespread complaints on social networks.

Tim Farrar, an analyst at TMF Associates, has said there are major outages of at least one telecom provider every year, although typically they are not national.