Error 
ORA-12546: TNS:permission denied

sys/khan as sysdba

Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\User>SET
ALLUSERSPROFILE=C:\ProgramData
APPDATA=C:\Users\User\AppData\Roaming
CommonProgramFiles=C:\Program Files\Common Files
CommonProgramFiles(x86)=C:\Program Files (x86)\Common Files
CommonProgramW6432=C:\Program Files\Common Files
COMPUTERNAME=USER-PC
ComSpec=C:\windows\system32\cmd.exe
configsetroot=C:\windows\ConfigSetRoot
FP_NO_HOST_CHECK=NO
HOMEDRIVE=C:
HOMEPATH=\Users\User
LenovoTestLogFile=preload.log
LenovoTestPath=C:\prdv10\
LOCALAPPDATA=C:\Users\User\AppData\Local
LOGONSERVER=\\USER-PC
NUMBER_OF_PROCESSORS=2
OS=Windows_NT
Path=D:\oracle\product\10.1.0\db_1\bin;D:\oracle\product\10.1.0\db_1\jre\1.4.2\b
in\client;D:\oracle\product\10.1.0\db_1\jre\1.4.2\bin;C:\windows\system32;C:\win
dows;C:\windows\System32\Wbem;C:\windows\System32\WindowsPowerShell\v1.0\;c:\Pro
gram Files (x86)\Microsoft SQL Server\90\Tools\binn\
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
PERL5LIB=D:\oracle\product\10.1.0\db_1\perl\lib\5.6.1\MSWin32-x86;D:\oracle\prod
uct\10.1.0\db_1\perl\lib\5.6.1;D:\oracle\product\10.1.0\db_1\perl\5.6.1\lib\MSWi
n32-x86;D:\oracle\product\10.1.0\db_1\perl\site\5.6.1;D:\oracle\product\10.1.0\d
b_1\perl\site\5.6.1\lib;D:\oracle\product\10.1.0\db_1\sysman\admin\scripts
PROCESSOR_ARCHITECTURE=AMD64
PROCESSOR_IDENTIFIER=Intel64 Family 6 Model 23 Stepping 10, GenuineIntel
PROCESSOR_LEVEL=6
PROCESSOR_REVISION=170a
ProgramData=C:\ProgramData
ProgramFiles=C:\Program Files
ProgramFiles(x86)=C:\Program Files (x86)
ProgramW6432=C:\Program Files
PROMPT=$P$G
PSModulePath=C:\windows\system32\WindowsPowerShell\v1.0\Modules\
PUBLIC=C:\Users\Public
SESSIONNAME=Console
SystemDrive=C:
SystemRoot=C:\windows
TEMP=C:\Users\User\AppData\Local\Temp
TMP=C:\Users\User\AppData\Local\Temp
USERDOMAIN=User-PC
USERNAME=User
USERPROFILE=C:\Users\User
windir=C:\windows

C:\Users\User>LSNRCTL STATUS

LSNRCTL for 32-bit Windows: Version 10.1.0.2.0 - Production on 29-AUG-2010 23:41
:05

Copyright (c) 1991, 2004, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 10.1.0.2.0 - Produ
ction
Start Date                29-AUG-2010 23:16:12
Uptime                    0 days 0 hr. 24 min. 53 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   D:\oracle\product\10.1.0\db_1\network\admin\listener.o
ra
Listener Log File         D:\oracle\product\10.1.0\db_1\network\log\listener.log

Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROCipc)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=User-PC)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

C:\Users\User>LSNRCTL SERVICE

LSNRCTL for 32-bit Windows: Version 10.1.0.2.0 - Production on 29-AUG-2010 23:41
:08

Copyright (c) 1991, 2004, Oracle.  All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
    Handler(s):
      "DEDICATED" established:0 refused:0
         LOCAL SERVER
The command completed successfully

C:\Users\User>