When a user successfully signs in from a previously unknown IP address or device, GitLab notifies the user by email. In this way, GitLab proactively alerts users of potentially malicious or unauthorized sign-ins.
There are several methods used to identify a known sign-in. All methods must fail for a notification email to be sent.
- Last sign-in IP: The current sign-in IP address is checked against the last sign-in IP address.
- Current active sessions: If the user has an existing active session from the same IP address. See Active Sessions.
- Cookie: After successful sign in, an encrypted cookie is stored in the browser. This cookie is set to expire 14 days after the last successful sign in.