Slowness In Portal

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Hi,

There is a problem, but i am not understanding what it could be,

and the problem is:

There has been slowness in in portal . Please check following errors found from portal logs:

1)

Session unknown: Request with URI=/webdynpro/dispatcher/sap.com/tc_kmcbc.uwl.ui~wd_ui/UWL was sent to unknown session. Either request with wrong session parameters was sent, or session has expired before Sun Jan 27 05:04:14 EET 2008. Current request parameters={sap-ext-sid=N0WNXfLH4kfbmBCO0DHweA==Vp8e1OUJRCzhJR4cUyvAzA==, sap-wd-cltwndid=WID1203055611294, sap-wd-norefresh=X, sap-ep-version=7.00.200702010738}. Is termination request=false. Request was sent from host with IP=146.81.182.9/name=146.81.182.9. Hint: see SAP note 842635 for more details on session expiration. RID=1cb0c210db8d11dcc794001125a6a682

[EXCEPTION]

com.sap.tc.webdynpro.clientserver.session.SessionExpiredLongJumpException: Session has expired (current request: follow-up request). Please restart the application. Hint: HttpSession seems to be expired due to user inactivity or application is called with wrong URL parameter (sap-wd-norefresh=X).

2)

com.sap.pct.hcm.objectanddataprovider.proxyclasses.Hrwpc_Rfc_Get_Objects_FaultException:

CFTableViewModel.getColumnCount caught exception

can any one suggest me what could be the problem.

little bit of urgent.

Regards,

Krishna