Adding captcha requirement to the Admin signin and Forgot password page helps increase your store security to the next level. The captcha number will be able to reload unlimitedly when users click on the
In the previous topic, I introduced how to enable customer login or register Captcha in Magento 2. Now I will continue to show you how to enable admin login Captcha in Magento 2.
Stores. In the
Advancedin the panel on the left
CAPTCHAsection, and continue with following:
Enable CAPTCHA on Frontendfield, select “Yes” to enable CAPTCHA on Frontend
Fontfield, select the name of the Font to be used for the CAPTCHA symbols. The default is LinLibertine.
Forms field, select one of the following forms where CAPTCHA is to be used
Displaying Mode, choose one of the following
Number of Unsuccessful Attempts to Login field, enter the number of unsucessful attempts to login before captcha appears. If you enter Zero, the Captcha will be always available
CAPTCHA Timeout (minutes) field, enter the number of minutes before the CAPTCHA expires. When the CAPTCHA expires, the user must reload the page to generate a new CAPTCHA.
Number of Symbols field, enter the range number of symbols that CAPTCHA will be changed in, for example: 3-7. The maximum number of symbols is eight.
Symbols Used in CAPTCHA field, specify the symbols that can be used in the CAPTCHA. Set only letters (a-z and A-Z), or number (0-9) to enter into the box. No spaces or other characters are allowed and the similar symbors is not used in the default.
Case Sensitive field, select
Yes if you require that the user enters the uppercase and lowercase characters exactly as shown
Ref: Magento 2 User Guide
It comes to the end of tutorial: How to Enable Admin Login Captcha in Magento 2.