Could not open the Enterprise Manager



I installed Oracle 10g Enterprise Edition 2 days ago, It gave me the
url path for
grid control

http://192.168.1.100:5500/em
and isql plus
http://192.168.1.100:5560/isqlplus
These urls are working fine till yesterday. but now it does not work.


I tried to "startup" the database through the SQL*plus command it says
"ORA-01031: insufficient privileges".


help me out.
lucky

.



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