If you are having problems getting your client application to communicate with a database server, ensure that the client and the database server are using compatible protocol stacks.
One way to isolate network communication problems is to work up the protocol stack, testing whether each level of communication is working properly.
If you can connect to the server computer, the data link layer is working, regardless of whether the connection is made using the same higher-layer protocols you will be using for SAP Sybase IQ.
For example, try to connect to a disk drive on the computer running the database server from the computer running the client application.
Once you have verified that the data link layer is working, next verify other applications using the same network and transport layers as SAP Sybase IQ are working.