What have I done wrong in this case?

[root@amd450 amanda]# su -
[root@amd450 root]# amrecover tagesbackup
AMRECOVER Version 2.4.3. Contacting server on localhost ...
220 amd450 AMANDA index server (2.4.3) ready.
500 Access not allowed: [access as amanda not allowed from root@amd450] 
amandahostsauth failed
[root@amd450 root]# whoami
root
[root@amd450 root]#

entries in my .amandahosts file:

localhost amanda
localhost root
localhost.localdomain amanda
localhost.localdomain root
backupstorm.medienpartner.de amanda
backupstorm.medienpartner.de root
backupstorm root
backupstorm amanda
amd450.medienpartner.de amanda
amd450.medienpartner.de root


With regards and thanks in advance to the one who hast the right answer

pascal