Enabling Guest Login
To enable Guest User to TeamCity:
Navigate to Administration page and click Server Configuration link.
Select Allow to login as a guest user option. The Login as a guest user link appears on the Login page.
To customize more details of these users' rights:
Click the Configure guest user roles link and specify the desired restrictions on a page which opens.
After you have configured at least one project in TeamCity, you can specify the roles and permissions of the guest users in it. When a new guest user account is created, it gets the specified roles by default. Click the Assign role link to associate the default guest account with a role for the selected projects.
See also:
Concepts: User Account | Role and Permission Administrator's Guide: Configuring Authentication Settings | Managing Users and User Groups