Use Oracle SQL Developer to connect to the database, suggests the following error, do not know how to deal with:
Perform the requested operation encountered error:
IO error: The Network Adapter could not establish The connection
Supplier code: 17002
Black box can log in successfully,
But on the Sql Developer connection failure

CodePudding user response:

CodePudding user response:

Login interface screenshots,

CodePudding user response:

1, listening is normal
2, confirm the tnsname configuration is normal

CodePudding user response:

Telnet to connect the port 1521,

CodePudding user response:

Said learn