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Fatal NI connect error 12500, connecting to:
 (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=server)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ora817)(CID=(PROGRAM=D:\Program Files\Sybase\PowerBuilder 8.0\pb80.exe)(HOST=SERVER)(USER=Administrator))))

  VERSION INFORMATION:
	TNS for 32-bit Windows: Version 8.1.7.0.0 - Production
	Windows NT TCP/IP NT Protocol Adapter for 32-bit Windows: Version 8.1.7.0.0 - Production
  Time: 08-12月-2005 22:49:08
  Tracing not turned on.
  Tns error struct:
    nr err code: 0
    ns main err code: 12564
    TNS-12564: TNS：拒絕連接
    ns secondary err code: 0
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0