You may experience problems connecting to a database.
A data source is a set of connection parameters, stored in the registry (on Windows) or in a file (Windows and UNIX).
Invalid user ID or password CT-LIBRARY error: ct_connect(): protocol specific layer: external error: The attempt to connect to the server failed.
You must supply the DBF parameter and the database file name to connect when you use Interactive SQL and you have restored the database from backup while connected to utility_db.
Could not connect to the database. Database server not found.When connecting from Interactive SQL, ensure that the name in the Server Name field is spelled correctly, that the network options on the network tab are correct, and that the database server has been started. Either provide the server name when connecting, or use the correct port number. To determine the server name and the number of the port on which the server is listening, run stop_iq (UNIX), which displays this information.
Unable to start — server not foundor:
Database server not running.when trying to start the client, the client cannot find the database server on the network. The connection string may be incorrect or the server name cache may contain incorrect or old connection information. For example, if the server is started with a different port number, even if the client application specifies the new port number at connect time, the connection information is still taken from the server name cache.
Try reconnecting without specifying CharSet. If the client's local character set is unsupported by the server, the connection succeeds, but with a warning that the character set is not supported.
Open Database Completed indicates that the database opened without error and the problem is related to the clients connecting. If the message does not appear, then the database may have failed while opening or recovering.