I have installed oracle Enterprice 11g database (Desktop mode). it was working fine, once I have stopped my database using sqlplus connected as=> conn sys@orcl as sysdba and used shutdown immediate now when I am starting it it is not connection to SID below is screen shot
Even I used Startup button on Enterprise Manager
and when I try to connect using sqlplus / as SYSDBA it says ora-01031-insufficient privileges
Error Log
Fatal NI connect error 12505, connecting to: (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SID=orcl)(CID=(PROGRAM=D:\app\Ravi_Bhushan\product\11.2.0\dbhome_1\bin\emagent.exe)(HOST=RAVIBHUSHAN-PC)(USER=SYSTEM))))
VERSION INFORMATION: TNS for 32-bit Windows: Version 11.2.0.1.0 - Production Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 11.2.0.1.0 - Production Time: 12-NOV-2013 15:14:32 Tracing not turned on. Tns error struct: ns main err code: 12564 TNS-12564: TNS:connection refused ns secondary err code: 0 nt main err code: 0 nt secondary err code: 0 nt OS err code: 0