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Fatal NI connect error 12541, connecting to:
(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=srvimm)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=imm1)(CID=( PROGRAM=C:\Programmi\Quest Software\TOAD\TOAD.exe)))

VERSION INFORMATION:
TNS for 32-bit Windows: Version 8.1.7.0.0 - Production
Oracle Bequeath NT Protocol Adapter 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: 26-NOV-2002 09:25:24
Tracing not turned on.
Tns error struct:
nr err code: 0
ns main err code: 12541
TNS-12541: TNS:no listener
ns secondary err code: 12560
nt main err code: 511
TNS-00511: No listener
nt secondary err code: 61
nt OS err code: 0