Connection error in UWL

Hi,

I am getting the below mentioned exception when trying I get into the UWL page. This exception is coming only for some of the users. The users having super admin role does not get this exception. I think this has got to do something with the permissions and so I have checked the permissions for the different systems and it is fine. Can you please suggest if there is something that needs to be done in the security zone or elsewhere.

Exception type:com.sap.netweaver.bc.uwl.connect.ConnectorException Message:Tue Aug 01 09:47:44 GMT 2006 (Connector) :com.sap.mw.jco.JCO$Exception:You are not authorized to logon to the target system (error code 1).

Thanks

Mukesh