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For some strange reason I am no longer able to create groupnames or usernames (with useradd and groupadd) that contain a dot. Uptill now it was possible to create user&groupnames like c.smith but now I get these errors: [root at server etc]# useradd c.smith useradd: invalid user name 'c.smith' [root at server1 etc]# groupadd c.smith groupadd: c.smith is a not a valid group name