Jdeveloper not working all of sudden

My jdeveloper stop working.
I tried restart machine, reinstall Jdev. no help.
Here is the error I got:
500 Server Error
The following error occurred: [code=CANT_CONNECT] Could not connect because of networking problems. Contact your system administrator.
Could not open error file
does any one know what the issue is?
Thanks for any input

Not sure I follow.
Are you using BC4J?
What do you mean by "crosstab in the front end jdeveloper"?

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Jdeveloper not working all of sudden

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