Allo Communications customers in Lincoln and other cities in Nebraska were hit by an outage Friday.
Allo said on Twitter that the outage was affecting customers in Alliance, North Platte and parts of Lincoln.
In a statement, the company said the outage was caused by a scheduled maintenance on a redundant transport circuit.
"When the circuit was reconnected, an internet addressing server did not return to its redundant state, which impacted certain customers in three of our markets, including Lincoln," The statement said. "Our engineers are working to restore service as quickly as possible."
The company did not specify where in Lincoln the outage was occurring or how many customers were affected, but it did say that it was mostly residential customers who were affected.
According to reports on social media, the outage appeared to start sometime after midnight and was affecting Allo internet and TV services. Customers reported long phone wait times trying to reach customer service.
As of late Friday afternoon, Allo had yet to determine when service would be restored.
"We sincerely apologize for the disruption and understand this may have caused customers significant inconvenience," the company said in its statement.
"Providing reliable service is imperative to Allo. We can assure our customers we will take steps to ensure an outage of this nature does not occur in the future."
Allo, which is owned by Lincoln-based financial services company Nelnet, has been building out a fiber network in Lincoln since early 2016. It hopes to have service available to the entire city by sometime next year.