Hi
Do you use Power BI Desktop to connect to remote Oracle database? If that is the case, there are some proposals for you troubleshooting this issue.
1. Make sure you have installed the latest version of Oracle client following the instructions in this article. Ensure that your Oracle client, Oracle Server and Power BI Desktop have the same bitness(32bit or 64bit).
2. Make sure the Host IP you update in listener.ora is correct, you can use ipconfig command to verify the Host IP.
3. Restart LISTENER with the following commands.
lsnrctl stop
lsnrctl start
4. Use TNSPING to test the connectivity from Desktop to Oracle server.
5. When connecting to Oracle from Power BI desktop, enter the connection details in TNSnames.ora file, then check if it is successful. Alternatively, you can connect to the Oracle Database via EZConnect connection string. For more details, please review this similar blog.
Thanks,
Lydia Zhang