Define R/3 system in EP: System Connection Test failes

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Hi all

I want to configure a R/3 system (fixed application server) in SAP EP Netweaver 04. I am pretty sure that the connection details and the user mapping is ok. When I test the connection I get

Test Connection with Connector

Test Details:

The test consists of the following steps:

1. Retrieve the default alias of the system

2. Check the connection to the backend application using the connector defined in this system object

Results

Retrieval of default alias successful

Connection failed. Make sure that Single Sign-On is configured correctly

I now used the tool described in OSS Note 785029:

- When I test connection for the JCO Client Service using the system alias the test is successful

- When I test connection for the Connector Gateway Service for the same system alias I get an exception:

com/sap/portal/connectivity/ConnectivityRuntimeException

Any idea? What can go wrong between the Connector Gateway Service and the JCO?

Bye

Michael