RMAN Backup hangs indefinitely at <release channels> in the backup sequence (4038269)

No errors being thrown in the Oracle Backup Sequence after initiating RMAN connection to channels.

Upon review it would seem that the Oracle Plugin is configured correctly with paths and set names input correctly

No password file stored in Oracle.

Normally, as a DBA you would use sqlplu "/as sysdba" to connect to the database. No need to enter a password. However, this is due to using OS Level Authentication. By default, the Oracle Plugin will use OS Authentication unless you use a password file.

So, when configuring the NetVault Oracle Plugin, be sure to de-select ' Use Oracle Password File Authentication' 

See below more details on both authentication types from the "NetVault Plugin for Oracle" User's Guide.

  Use Oracle Password File Authentication – Oracle supports two methods to authenticate DBAs or SYSDBA users: OS authentication and password-file authentication. Select this option to enable the password file as the authentication method. Oracle’s OS authentication takes precedence over password-file authentication; that is, if the requirements for OS authentication are met, even if you use a password file, the user is authenticated by OS authentication. When this option is selected, the plug-in uses the SYSDBA authentication details from the Oracle password file to connect to the Oracle target instance with RMAN: connect target /@

When this option is cleared, the plug-in will use OS authentication when connecting to the Oracle target instance: connect target /