Perform the following steps to troubleshoot Windows Firewall exceptions.

1. Examine Oracle configuration files (such as *.conf files), the Oracle key in the Windows registry, and network configuration files in ORACLE_HOME\network\admin.
2. Pay particular attention to any executable listed in ORACLE_HOME\network\admin\listener.ora in a PROGRAM= clause. Each of these must be granted an exception in the Windows Firewall, because a connection can be made through the TNS Listener to that executable.
3. Examine Oracle trace files, log files, and other sources of diagnostic information for details on failed connection attempts. Log and trace files on the database client computer might contain useful error codes or troubleshooting information for failed connection attempts. The Windows Firewall log file on the server might contain useful information as well.
4. If the preceding troubleshooting steps do not resolve a specific configuration issue, then provide the output from command netsh firewall show state verbose=enable to My Oracle Support for diagnosis and problem resolution at:

   https://support.oracle.com/