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NEW YORK — Time Warner Cable has largely restored service after an outage cut Internet and on-demand cable service to customers across the United States this morning.

The company says a problem that occurred during routine maintenance caused the nationwide outage.

Time Warner Cable says it is still investigating the cause of the problem, which occurred with its Internet backbone, the paths that local or regional networks connect to in order to carry data long distances.

The company says the problem affected all of its markets and started at 4:30 a.m. and was largely restored by 6 a.m., and updates continue to bring all customers back online. The outage sparked widespread complaints on social networks.

Time Warner Cable, which is in the process of being bought by rival Comcast Corp. for $45 billion, has about 11.4 million high-speed data subscribers in 29 states nationwide.

On Tuesday, the Federal Communications Commission said Time Warner Cable, based in New York, would pay $1.1 million to resolve outage reporting violations.