Oracle21c, No TNS entries found error, The Network Adapter could not establish connection error

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Status: Failure -Test failed: IO Error: The Network Adapter could not establish the connection

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Oracle SQL Developer | Database not connecting SID issue [FIXED] 2022

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ora 12505 || ora-12505: TNS:listener does not currently know of SID [solved] ✅ || 12505

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[SOLVED] ORA-12560: TNS : protocol adaptor error in Oracle 21c | Fix Protocol Adapter Error

sqldeveloper ORA-12505. TNS: listener does not currently know of SID given in connect descriptor

Status : Failure -Test failed: IO Error: The Network Adapter could not establish the connection

FIX: ORA-12505 || ORA-12505: TNS:listener does not currently know of SID [solved] ✅ || 12505