If you have more than one protocol stack installed on the client or server computer, ensure that the client and the database server are using the same protocol.
The -x command line switch for the server selects a list of protocols for the server to use, and the CommLinks connection parameter does the same for the client application.
You can use these options to ensure that each application is using the same protocol.
By default, both the database server and client library use all available protocol stacks. The server supports client requests on any active protocol, and the client searches for a server on all active protocols.
For more information about the start_iq database startup utility -x switch, see the Utility Guide.