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Io exception: Unknown host specified [message #537726] Fri, 30 December 2011 10:23
emadnabil
Messages: 152
Registered: August 2007
Senior Member
Hii all
I installed oracle database 10g
and openned the "Enterprise Manager Database Control"
then i connect normally using the "sys" user

but when i switch between the tabs (performance , administration)
it ask again for the connection string
and when i enter it again it fails to connect by this message
Io exception: Unknown host specified

please help
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