The authtype placeholder specifies an authorization type, which is the mode in which Oracle Secure Backup authenticates itself to the NDMP server. Typically, you should use the negotiated default setting. You can change the setting if necessary; for example, if you have a malfunctioning NDMP server.
none | negotiated | text | md5
Oracle Secure Backup sends the NDMP server an "authorize client" message specifying NDMP's "none" authentication mode. Most servers do not accept this type of authentication.
Oracle Secure Backup determines (with the NDMP server) the best authentication mode to use. This is the default setting for the NDMP default and policies value.
Oracle Secure Backup uses plain, unencrypted text to authenticate.
Oracle Secure Backup uses the MD5 digest algorithm to authenticate.