[SOLVED] strange login problems with user despite being root

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http://www.linuxquestions.org – Hello dear friends of linux I am neither a newbie nor an expert. I am administering a debian webserver (lenny) and run into a strange problem respectively new behaviour. I login as root by ssh and want to change to another user so that I could run a program with the privileges and limitations of that user. So I used to do su <username> for this or login <username>. Now I still can do that for all users I tried but one. If I login as user openerp (which successfully starts daemons in the init process) I can authenticate myself if I go with "login opene (HowTos)