How to get rid of the error message from portal

HI,

When i look at the trace files all the times it throws one error which i am unable to figure our where it is coming from and how it is coming

error says that :Cannot get input and output streams from socket. ConnectionsManipulator is not initialized."

category:/System/Network/

Location:com.sap.engine.core.manipulator.TCPRunnableConnection.init()

Please help me in resolving this issue

Points will be awarded for sure

Bala Duvvuri