Resolving INS-20802: Oracle Net Configuration Assistant failed error on Windows 10
I was all excited about the migration to Windows 10 until I had to install Oracle client 12.1.0.2 on it. The Oracle client installation used to fail miserably at the last stage with this error named INS-20802.
As with several Oracle error messages, the details were hardly of any use and no clear understanding was possible even after examining the error log. Googling for the error led me to several forum posts but most of them didn’t have the right solution — most answer seekers were meeting with dead ends.
I tried several methods for resolving the issue —
- Disabling Windows UAC
- Disabling firewall
- Disabling antivirus — mine was a fresh VM, so disabled Windows Defender
- Adding localhost IP i.e., 127.0.0.1 to the hosts file etc.
but none of them helped.
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5
During the installation of SES, you may come across an error “[INS-20802] Oracle Net Configuration Assistant failed.”
This error is due to conflict between a declared environment variable and a configuration value provided during the installation. The variable usually causing this is “ORACLE_HOME”
You can get further details of this issue from the log file located at
C:Program FilesOracleInventorylogsinstallActionsyyyy-mm-dd_hh-mm-ss*.log
Further Details
Go to the bottom of the log file and you will see messages like
WARNING: oracle.net.ca.NetCAFatalException: Environmental error detected: Oracle Home is set to "D:Oracleproduct11.2.0sesdb_1" in the environment is different from Oracle Net Configuration Assistant installed Oracle Home. WARNING: Verify that the ORACLE_HOME environment variable or registry setting is set to correct value and relaunch Oracle Net Configuration Assistant. WARNING: WARNING: at oracle.net.ca.NetCALogger.getOracleHome(NetCALogger.java:236) WARNING: at oracle.net.ca.NetCALogger.initOracleParameters(NetCALogger.java:215) WARNING: at oracle.net.ca.NetCALogger.initLogger(NetCALogger.java:130) WARNING: at oracle.net.ca.NetCA.main(NetCA.java:427) INFO: INFO: Error: Environmental error detected: Oracle Home is set to "D:Oracleproduct11.2.0sesdb_1" in the environment is different from Oracle Net Configuration Assistant installed Oracle Home. INFO: Verify that the ORACLE_HOME environment variable or registry setting is set to correct value and relaunch Oracle Net Configuration Assistant. INFO: INFO: Oracle Net Services configuration failed. The exit code is 1 INFO: WARNING: INFO: Completed Plugin named: Oracle Net Configuration Assistant
Resolution
Delete the Environment Variable “ORACLE_HOME” and you can do a Retry, but most likely the installation wizard will continue to throw the same error. The best option to to deinstall Oracle SES so that everything is clean again. Try to install it again.