Hello jahnavi, security pin is the code you should enter to prove that you are not a robot, it comes into play generally when you are applying for any exam. Sometimes , the server may not respond and the may stop working, try the same method of entering the security pin again after some time as the server traffic may get cleared.

Hope this helps.

Thank you.

Hey!There

Security pin is the content of captcha box which you must need to fill in order to move next page.This pin check user is robot or not.Right now,server of NTA is too busy so wait few hours to get hassle-free service..

Ask if any query..