High-speed Internet service to millions of Comcast customers along the Eastern Seaboard were hit late Sunday, due to some glitch in the DNS (Domain Name System) service of the company.

Going by several media reports, the malfunction affected Comcast's Internet to customers in Connecticut, Maryland, Massachusetts, New Hampshire, New York, Virginia, and D. C.

The news of the massive outage was a disappointing one for a number of customers, especially those who had made plans to explore the Web late Sunday in preparation for Cyber Monday sales, most of which commenced at midnight.

About the malfunction, a Comcast spokesman told NBC News that the problem largely affected the company's high-speed Internet service; and that there was apparently no impact on Comcast's digital TV and telephone offerings.

The spokesman said: "We certainly apologize for any inconvenience this (the outage) may be causing our customers." Later, reports started pouring in about the restoration of the service as of early Monday.

While repairs were reported underway late Sunday, Comcast's customer service representative Bill Gerth - gloomily hinting at the massive extent of the disruption - said in a Twitter post: "I appreciate everyone's patience during this unexpected outage."