There was reported problem since the morning that price feed of the indexes are not showing or were frozen. Accordingly, NSE has closed F&O market at 11:40 am and the cash market at 11:43 am. NSE says that the update for the re-opening will be shared later.
"There is an issue with live ticks for NSE indices (Nifty 50, Nifty Bank and others) across brokers. We are in touch with NSE to have this fixed," Brokerage firm Zerodha said in a tweet.
Full"NSE does all sort of Mock Trading sessions for system testing, still such things happen in real time and not during mock sessions. Face with rolling eyes. *NIFTY / BANKNIFTY spot prices frozen since 10:07*," one user who took to Twitter pointed out.