Final answer:
The 'ora-12162 TNS' error indicates a mismatch between the service name specified in your application's connection string and entries in the Oracle network configuration files. Check and ensure that the service names in 'tnsnames.ora' file match and are correctly configured to resolve the error.
Step-by-step explanation:
If you are getting an ora-12162 TNS 'net service name is incorrectly specified' error, this typically means there is an issue with how the Oracle service name is defined in your network configuration. The Oracle service name is a type of alias used by clients to connect to a database in the Oracle network environment. This error may arise if the service name specified in your application’s connection string does not match any service names defined in the Oracle network configuration files like 'tnsnames.ora' or 'sqlnet.ora'. To resolve this, you need to ensure that the service name in your connection string exactly matches an entry in your 'tnsnames.ora' file, and that this file is correctly located and configured.