StackProtect is a security system aimed to increase the security of websites by presenting suspicious requests with a simple captcha to verify the user is genuine. Once a user has passed the captcha their IP address is automatically whitelisted for 48 hours by all sites across the 20i platform, so they won't hit StackProtect again during this time.
In a rare case, if you believe the captcha should not be triggered for a particular user, please open a support ticket and provide us the time and the IP address of the user it was triggered for. If you could also let us why you believe it was wrong to present StackProtect for this request then we might be able to disable StackProtect, however, it's not recommended as it provides a key element in the process of securing a website from attacks.
