SLD_CLIENT_EXCEPTION

We have an XI system in productive use that seems to be running fine. But in the J2EE defaultTrace.trc log I see some part of the system trying to connect to the SLD with a wrong port number. (A number we used at installation time, but have since changed in all the right places: SLD data supplier, exchange profile etc.)
This is from the log:
Caught a JCO.J2EEAbapException while processing a JCO request. Check the RFC engine for sanity and check your server logs and traces for more information.
Thrown:
com.sap.mw.jco.JCO$J2EEAbapException: (126) SLD_CLIENT_EXCEPTION: AbapSLDRequestHandler.getObjectServer(): Unable to open connection to host "ourhost.ourdomain.com:50000". The host is down or unavailable..
com.sap.mw.jco.JCO$AbapException: (126) SLD_CLIENT_EXCEPTION: AbapSLDRequestHandler.getObjectServer(): Unable to open connection to host "ourhost.ourdomain.com:50000". The host is down or unavailable..
The port it tries to connect to is incorrect. But where does it get that port no.? It is not in RZ70, SLD Data supplier or exchange profile.
-AD

Have you cheched the transaction SLDAPICUST and the SLDCHECK ?
Also open the J2EE Visual Administrator and drill down to server -> services -> SLD Data Supplier. On the 'Runtime' tab in the right frame, select the tab 'HTTP Settings'. Enter the rightSLD address and maintain, if necessary, the provided user. The user must exist on the new SLD host. Save your entries. To apply the new configuration immediately, restart the SLD service (select stop, then start, from the context menu of the service "SLD Data Supplier"). The first data transfer to the SLD takes place after several minutes.
Sandro

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         at java.lang.reflect.Method.invoke(Method.java:324)
         at com.sap.engine.services.ejb.session.stateless_sp5.ObjectStubProxyImpl.invoke(ObjectStubProxyImpl.java:187)
         at $Proxy193.processFunction(Unknown Source)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:324)
         at com.sap.engine.services.rfcengine.RFCDefaultRequestHandler.handleRequest(RFCDefaultRequestHandler.java:100)
         at com.sap.engine.services.rfcengine.RFCJCOServer.handleRequestInternal(RFCJCOServer.java:113)
         at com.sap.engine.services.rfcengine.RFCJCOServer$ApplicationRunnable.run(RFCJCOServer.java:171)
         at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
         at java.security.AccessController.doPrivileged(Native Method)
         at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
         at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)
    any idea what its means?

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