The exchange had stopped trading in cash as well as F&O (futures and options) segments while stock prices were also not getting updated.
In a statement, Sebi said it is in touch with the NSE on the issue.
"Sebi is in touch with the NSE and is closely monitoring the situation," the regulator said in a statement.
After addressing the technical glitch, the exchange resumed trading at 1230 hours.
An NSE spokesperson said cash and F&O segments are functioning normally, but a "display issue has been noticed which is being addressed".