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Cannot switch, ssh to specific user: su: cannot set user id: Resource temporarily unavailable?

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http://unix.stackexchange.com – /var/log/secure: su: pam_keyinit(su-l:session): Unable to change UID to 500 temporarily su: pam_keyinit(su-l:session): Unable to change UID to 500 temporarily su: pam_unix(su-l:session): session opened for user adtech by root(uid=0) su: pam_unix(su-l:session): session closed for user adtech I guess this is caused by per-user limit, but there is no different when comparing with another user. Here're ulimit -n for adtech: [adtech@hmaster87 root]$ ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (HowTos)