EGI CSIRT site security contacts challenge was run on the 16th of November 2021. During the campaign, the EGI CSIRT sent an email with a unique reaction link to all site security contacts. The purpose of this type of challenge is to check the sites’ ability to respond in time for security-related matters, as well as to check that the contact data is valid. We thank all site security administrators for their participation. Several sites had stunning reflexes and reacted within less than a minute.