On our systems, we ran into debian creating a local user named backup. That caused problems with our NIS backup user. So we deleted the local and everything worked.
> I�am running amanda 2.4.2p2 in debian linux (installing from apt-get > ....) > My error is : > ERRROR: backup: [access as backup not allowed from backup@backup] > amandahostsauth failed > > Who is my problem? > > Who is the diference in Debian and other linux distributions?
