TNS-12637错误，用户连接不上？

sqlnet.log日志文件:

Fatal NI connect error 12637, connecting to:

 (LOCAL=NO)

  VERSION INFORMATION:

TNS for 32-bit Windows: Version 10.1.0.2.0 - Production

Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 10.1.0.2.0 - Production

Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 10.1.0.2.0 - Production

  Time: 14-1月 -2013 09:32:13

  Tracing not turned on.

  Tns error struct:

    ns main err code: 12637

    ***********************************************************************

Fatal NI connect error 12637, connecting to:

 (LOCAL=NO)

  VERSION INFORMATION:

TNS for 32-bit Windows: Version 10.1.0.2.0 - Production

Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 10.1.0.2.0 - Production

Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 10.1.0.2.0 - Production

  Time: 14-1月 -2013 09:32:13

  Tracing not turned on.

  Tns error struct:

    ns main err code: 12637

    TNS-12637: 包接收失败

    ns secondary err code: 12547

    nt main err code: 0

    nt secondary err code: 0

    nt OS err code: 0

TNS-12637: 包接收失败

    ns secondary err code: 12547

    nt main err code: 0

    nt secondary err code: 0

    nt OS err code: 0

目前还没有找到解决方法！！！

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