2095031 - User cannot logon on to BFC web - BFC 10.0

Some user cannot logon to BFC and get following error on web page.

The RPC Server is unavailable(Exception from HResult 0x800706BA)

Web log:

20xx-xx-xx xx:xx:xx,514 [thread 96] INFO  application.connection - Login failed - (User:XXXXX) [DSRRootContextID: ] [DSRTransactionID: ] [DSRConnectionID: ] [DSRCounter: ]

System.Runtime.InteropServices.COMException (0x800706BA): The RPC server is unavailable (Exception from HResult 0x800706BA )

Event log:

Faulting application name: ctserver.exe, version: 10.0.0.1563, time stamp: 0x53331311

Faulting module name: KERNELBASE.dll, version: 6.1.7601.17514, time stamp: 0x4ce7bafa

ADPlus log:

Faulting module name: nsc.dll

SAP Financial Consolidation 10.0

KBA , features and functionality , best practices , EPM-BFC-TCL , Technical Components , Problem