At www.redmine.org, we have made two-factor authentication (2FA) mandatory for all users to help prevent spam and strengthen security.
If you have not enabled 2FA on www.redmine.org, you will be asked to set it up the next time you sign in. Please follow the on-screen instructions and use a TOTP-compatible authentication app such as Google Authenticator, Microsoft Authenticator, Authy, or Duo Mobile.
Background
In recent years, we have seen an increase in spam and test submissions on Redmine.org. To address this problem and to better protect user accounts, we have made 2FA mandatory.
Two-factor authentication also greatly reduces the risk of account takeovers and improves the overall security of the site.
While the registration process for new users will take a bit more effort, it may help reduce spam and test submissions to some extent.
We apologize for the extra steps required to sign in and appreciate your cooperation.