SQL Server 6.5 uses three security modes:

• Standard
• Integrated
• Mixed

The security mode is selected during SQL Server 6.5 installation and can

be modified at any time.

To change the security modes, you can do the following:

Click Start, Programs, Microsoft SQL Server 6.5 and click

SQL Enterprise Manager to run SQL Enterprise Manager from the

Microsoft SQL Server 6.5 program group.

Select the server you want to work with, then from the Server menu

select SQL Server, Configure and choose the Security Options page.

Set SQL Server 6.5 security mode.

Standard Security

This security mode is used by default. In this case, SQL Server manages

its own login validation process for all connections, i.e. SQL Server

is wholly responsible for authenticating a user and for enforcing

password and login restrictions.

Integrated Security

When it is used, then Windows NT is responsible for managing user

connections through its Access Control List (ACL). So the advantage

of using Windows NT Integrated Security mode is single-password

access to all resources on a Windows NT domain and password aging

and encryption across the network.

With Integrated Security, only Multi-Protocol and Named Pipes clients

are supported, and only trusted connections are allowed into SQL Server

(trusted connections are only available via the Multi-Protocol or via

Named Pipes).

Mixed Security

Mixed Security is a combination of the standard and integrated security.

In this case, when a user connects to a SQL Server, then SQL Server

checks is it a trusted connection or not (checks is the login name

matches the user's network username, or if the login name is null).

If it is a trusted connection, then SQL Server uses Windows NT

authentication, if it is not a trusted connection then SQL Server

uses Standard Security (i.e. tried to find the same SQL Server login

name and password, as user has passed).

This security mode is usually used when there are many different clients

connected to SQL Server, and one of them use trusted connections and

other use standard security (SQL Server login and password).