Windows network domain

Windows network technology enables you to create network domains. A domain is a group of connected Windows computers that share user account information and a security policy.

A domain controller manages the user account information for all domain members. The domain controller facilitates network administration. By managing one account list for all domain members, the domain controller relieves the network administrator of the requirement to synchronize the account lists on each of the domain computers. In other words, the network administrator who creates or changes a user account must update only the account list on the domain controller rather than the account lists on each of the computers in the domain.

To log in to a Windows database server, a user on another Windows computer must belong to either the same domain or a trusted domain. A trusted domain is one that establishes a trust relationship with another domain. In a trust relationship, user accounts are only in the trusted domain.

A user who attempts to log in to a Windows computer that is a member of a domain can do so either by using a local login and profile or a domain login and profile. However, if the user is listed as a trusted user or the computer from which the user attempts to log in is listed as a trusted host, the user can be granted login access without a profile.
Important: A client application can connect to the database server only if there is an account for the user ID in the Windows domain in which the database server runs. This rule also applies to trusted domains.

If you specify a user identifier but no domain name for a connection to a workstation that expects both a domain name and a user name (domain\user), the database server checks only the local workstation and the primary domain for the user account. If you explicitly specify a domain name, that domain is used to search for the user account. The attempted connection fails with error -951 if no matching domain\user account is found on the local workstation.

Use the CHECKALLDOMAINSFORUSER configuration parameter to configure how the database server searches for user names in a networked Windows environment.

Table 1. Locations Informix searches for user names specified either alone or with a domain name.
  Domain and user specified User name only specified
CHECKALLDOMAINSFORUSER is unset Searches in the specified domain only Searches on the local host only
CHECKALLDOMAINSFORUSER=0 Searches in the specified domain only Searches on the local host only
CHECKALLDOMAINSFORUSER=1 Searches in the specified domain only Searches in all domains
Important: The database server's trusted client mechanism is unrelated to the trust relationship that you can establish between Windows domains. Therefore, even if a client connects from a trusted Windows domain, the user must have an account in the domain on which the database server is running.

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