The Network Adapter could not establish the connection

#oracle #oracledba #oracledatabase #dba #sql #plsql
ORA-12560: TNS: protocol adapter error | No listener
The Network Adapter could not establish the connection
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
64-bit Windows Error: 61: Unknown error
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC) (KEY=EXTPROC1521)))
TNS-12541: TNS: no listener
TNS-12560: TNS: protocol adapter error
TNS-00511: No listener
64-bit Windows Error: 2: No such file or directory
Listener services are not working
How to fix listener connection error?
#How to resolve listener connection issue?
#How to fix database connectivity issue?
#How to fix environment variable issue of database?
#How to fix database connection issue?
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