SGD supports 2 main authentication models:
- System (or built-in) Authentication
- Third Party (aka Web) Authentication
System Authentication
When you see the standard SGD login box you're using System Authentication. This is where SGD takes the credentials you enter and runs them against a set of Login Authorities to see if you're allowed in. It typically looks like this:

Supported Login Authorities include:
- UNIX authentication
- LDAP authentication
- Active Directory authentication
- RSA SecurID authentication
Third Party or Web Authentication
Users typically access SGD via a browser by visiting "http://servername/sgd". And because that's just a web page some people may like to protect it using the same authentication system that they use to protect other URLs.
There are many different ways of protecting URLs but the 3 main steps are the same:
- protecting the /sgd URL
- consolidating login steps or web single sign-on
- deciding which applications the user gets.
So let's look at a few in more detail
| HTTP Basic Authentication |
| Sun Access Manager |