How to resolve "TNS-12520 TNS:listener could not find available handler for requested type"?

Posted by Roman Kagan on Stack Overflow See other posts from Stack Overflow or by Roman Kagan
Published on 2010-04-29T19:33:11Z Indexed on 2010/04/29 19:37 UTC
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tnsnames

I have brand new MacBook Pro (Mac OS 10.6.3) and installed Oracle's SQLDeveloper. After doing so, I set the connection and was connecting just fine. But after an hour or so I got "TNS-12520 TNS:listener could not find available handler for requested type". I wonder how can I fix it?

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