I have found one fatal error in default traces of XI system. Error states as
Unable to log on to system PEU in language en with user PIRWBUSER
MESSAGE ID: com.sap.aii.rwb.core.rb_core.wrongUserPassword
com.sap.aii.rwb.exceptions.OperationFailedException: Unable to log on to system PEU in language en with user PIRWBUSER.
Here PEU is an R/3 system.
Could you please help me in finding the root cause for the above error.