ORA-12154: TNS:could not resolve the connect identifier specified (4250009)

When attempting to establish a connection to an Oracle Database using either Quick Connect or the Active Roles Synchronization Service, the following error is received: 

ORA-12154: TNS:could not resolve the connect identifier specified

Verify a TNSNames.ora file exists on the QuickConnect/Active Roles Synchronization Service server

• By default, the TNSNames.ora file resides in <OracleInstallDirectory>\network\admin
• If the TNSNames.ora file does not exist, reference the following guide on how to create one:
• https://oracle-base.com/articles/misc/oracle-network-configuration

Set the TNS_Admin environment variable if it is not set

• Navigate to Control Panel > System
• Select Advanced System Settings
• In the Advanced tab, select Environment Variables
• Under System Variables, click New
• In the Variable name text box, type TNS_ADMIN
• In the Variable value text box, type the location of the TNSNames.ora file
• Click OK to add the variable
• Restart the server