MSS / Portal Errors

Question

Hi experts,
Got a strange issue on here, hope somebody can help me.
We have 2 portals which exactly the same pointing to 2 qa clients, one a training and one a QA system.   Both clients are on the same back end system.
When trying to input an appraisal entry in the training system this error occurs: -
com.sap.aii.proxy.framework.core.BaseProxyException: Screen output without connection to user., error key: RFC_ERROR_SYSTEM_FAILURE
and in st22 on the r3 side we get the error: -
Runtime Error          DYNPRO_SEND_IN_BACKGROUND
       Occurred on     06.02.2008 at   10:51:17
Error analysis
                                                                                During background processing, the system attempted to send a
screen to a user.
Current screen: "SAPLSTRD " 0351.                                                                               
When pointing to the other portal all works fine, only occurs on the portal.
Any ideas???
Thans

Answer 1

Nick
How we got it to work was to change the client setting in scc4.  The client was changed from "no changes allowed" to "changes without automatic recording". 
This isn't the SAP recommened setting, and the live works fine with "no changes allowed." ... but with its being the training client i'll not lose any sleep over changing that.
Ian