Using a browser and CICS Transaction Gateway on the same workstation

If you intend to use a browser and CICS® Transaction Gateway on the same workstation, remove ctgclient.jar and ctgserver.jar from the CLASSPATH setting. If you do not remove them, you are likely to receive the following error when running applications:
ERROR: java.io.IOException:
CTG6664E: Unable to load relevant class to support the tcp protocol
The reason for the error is that Java™ searches the CLASSPATH environment variable before downloading classes across the network. If the required class is local, Java attempts to use it. However, using class files from the local file system breaks Java application security rules; therefore an exception is raised.