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Environment/Versions TTworkbench 32/64 Bit Windows/Linux Answer Add the following option into Window > Preference > TTCN-3 > Execution > VM arguments, if the error below occurs. -Djava.rmi.server.hostname=127.0.0.1 It helps the runtime to identify the correct local host. [ERROR]: Error while loading test system:Exception creating  connection to: <some not existing IP address>; nested exception is: java.net.SocketException: Invalid argument or cannot assign requested address stack trace: java.rmi.ConnectIOException: Exception creating connection to: <some not existing IP address>; nested exception is: java.net.SocketException: Invalid argument or cannot assign requested address at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:631) at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216) at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:129) at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java: 194) at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148) at com.sun.proxy.$Proxy25.enableLogging(Unknown Source) at com.testingtech.ttworkbench.ttman.UIImpl.setupLoggingProfile(UIImpl.java:365) at com.testingtech.ttworkbench.ttman.UIImpl.loadTestSystem(UIImpl.java:310) at com.testingtech.ttworkbench.ttman.handles.HTestSuite.loadTestSuite(HTestSuite.java:1420) at com.testingtech.ttworkbench.ttman.handles.HTestSuite.init(HTestSuite.java:1039) at com.testingtech.ttworkbench.ttman.views.ManagementView.loadCampaign(ManagementView.java:1573) at com.testingtech.ttworkbench.ttman.jobs.LoadCampaignJob.run(LoadCampaignJob.java:131) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54) Caused by: java.net.SocketException: Invalid argument or cannot assign requested address at java.net.PlainSocketImpl.socketConnect(Native Method) at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339) at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200) at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392) at java.net.Socket.connect(Socket.java:579) at java.net.Socket.connect(Socket.java:528) at jav ..