The connection is rejected if any of the following conditions occur:
In compliance with the X/Open standard for the CONNECT statement, the ESQL/C preprocessor supports a CONNECT statement that has a USER clause without the USING validation_var specification. If the validation_var is not present, however, the database server rejects the connection at runtime.
On UNIX, the user_id that you specify must be a valid login name and must exist in the /etc/passwd file. If the application connects to a remote server, the login name must exist in this file on both the local and remote database servers.
On Windows, the user_id that you specify must be a valid login name and must exist in User Manager. If the application connects to a remote server, the login name must exist in the domain of both the client and the server.
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