Web Platform Services strongly recommends using CalNet authentication for all sites. If you are working with a third-party vendor or collaborator who needs to be able to log in to your site, they can get an Affiliate or Guest account. Once the account is set up, they will be able to log in using CalNet authentication.
Unpaid collaborators qualify for Guest accounts. See CalNet Guest Accounts for more information. Any UC Berkeley employee can sponsor a guest account for unpaid collaborators. Guest accounts only have access to a small subset of the systems available to people with regular CalNet accounts.
If the third-party is paid by UC Berkeley, they must use an Affiliate account. Affiliate accounts are sponsored by departments, not individuals. Your HR administrators should be able to help you with the process. See Guest and Affiliate Accounts for more information.