NSE on Thursday said it had to halt trading on Wednesday because of instability to its online risk management system.
The instability was caused due to a disruption in telecom links offered by two service providers. "While there was no impact to the trading system, this instability resulted in an impact to the online risk management system, which also is configured in a High Availability mode," NSE said.
"Given that the online risk management system was unavailable, market functioning could not continue normally and hence had to be shut down," it added.
NSE said it is awaiting detailed root cause analysis from telecom service providers and vendors regarding this incident.