WHy Cover orders are blocked today

Today Doesn’t seem very volatile.Gap up opening and sometimes coming down happens many a times…
Suddenly saying CO is Blocked without any updates given in trading portal makes it unreliable for trading…

This is due to expected volatility. You can check status here.

Then how can we do Short-Selling today ?

You can use MIS Regular order type. Keep in mind this order type doesn’t have compulsary SL.

So, for Stop Loss, we can put an extra SL-M order, besides the Main Order (MIS-Regular) ?

Yes you can.