Why always fails to connect to Oracle 8.1.5.0

I try to connect to database server yesterday, but Net8 easyconfig frequently give me the message:"...ORACLE not available, there may be an error in the fields entered,or the server may not be ready for a connection." while i am testing connection.
I am urgent to get a answer from an expert what's wrong with it, i think the configuring value is not wrong and easy. Actually i had succeed in connecting it before, but it failed again now.
I am really crazy to this problem.

If Oracle reports error about Net8 configuration, that means -
you're trying to use "thick" JDBC driver, though usual way
is to use "thin" driver instead. You have to make corrections
in your connect url like:
"jdbc:oracle:thin:@<host>:<port>:<sid>"
^^^^
look here-----|
Hope this will help
Paul

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If Oracle reports error about Net8 configuration, that means -
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Can anyone shed any light on this problem I get when trying to connect to Oracle 10 DB. I guess it is some kind of permissions problem but the account I am using can be used with TOAD, Oracle Developer etc and has enough permissions in those tools to look
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Last Modified: 22/07/2014 16:42:22
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OS architecture: x64
Processor architecture: x86
Current culture: en-GB
UI culture: en-US
[Collector: Mandatory] [6240/3] [2015-01-07 12:43:07]: Oracle connection provider: OracleClient.
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https://support.microsoft.com/kb/2020711?wa=wsignin1.0
(See Resolution section).
Make sure the objects exist on the Oracle server/database too.
Hope this helps.
Regards,
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look here-----|
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Why always fails to connect to Oracle 8.1.5.0

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