Help Center/ Cloud Bastion Host/ FAQs/ Troubleshooting/ SSO O&M Faults/ Error Message "ORA-12537_TNS_Connection closed" Reported While Connecting to Oracle Databases
Updated on 2026-05-22 GMT+08:00
Error Message "ORA-12537_TNS_Connection closed" Reported While Connecting to Oracle Databases
Symptoms
The error message "ORA-12537_TNS_Connection closed" is reported while connecting to Oracle databases.
Possible Causes
Port 1521 may not be enabled.
Solution
Enable the communication between the local PC and the bastion host over port 1521 and communication between the bastion host and the database server over port 1521.
Parent topic: SSO O&M Faults
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