Why can't I connect to the ODBC-ODBC Bridge's target data source?

There can be many reasons for getting SQL_ERROR back from SQLDriverConnect or SQLConnect. Refer to How do I find out why an ODBC call is failing first. The most likely reasons are:

• "IM002 - DSN or TargetDSN not found." The Easysoft ODBC-ODBC Bridge client couldn't find the data source in odbc.ini or ODBC Data Source Administrator. The Driver Manager couldn't find the data source. The TargetDSN attribute was missing from the data source or connection string. Refer also to HY000 below.

  The most common reason for this when connecting to Windows is setting TargetDSN to specify a user DSN instead of a system DSN. Check that the ODBC data source on your Windows machine is a system DSN.

• "28000 - Invalid authorization specification." Either the LogonUser and LogonAuth attribute pair or the TargetUser and TargetAuth attribute pair have invalid values. LogonUser and LogonAuth must specify a user name and password that the ODBC-ODBC Bridge server can use to log on to the target machine. The ODBC-ODBC Bridge passes TargetUser and TargetAuth to the remote SQLDriverConnect call. The target ODBC driver uses these credentials for database authentication (if required).
• "08001 - Client unable to establish connection." The machine specified by Server can't be found, is not running the ODBC-ODBC Bridge server, or is affected by a networking issue. Check that the Server attribute value is a valid machine name or IP address. Check the machine name is resolvable by DNS or is present in the hosts file. Check that you are on the same network by pinging the target server. Check the Port attribute in the specified data source is correct. Try telnetting to the server machine on that port.
• "HY000 - A general error." Check that you've supplied all the connection attributes required to connect to the server. For example, if you omit the SERVER attribute from the data source, you get an IM002 error and then a secondary HY000 error explaining what the problem is.