user cannot login from anywhere

[MoonblueZ]

hii
i have a log like this in /var/log/messages

Mar 19 12:18:28 cidomo kernel: pid 689 (squid), uid 100: exited on signal 6
Mar 19 12:18:28 cidomo squid[661]: Squid Parent: child process 689 exited
due to signal 6
Mar 19 12:18:31 cidomo squid[661]: Squid Parent: child process 694 started
Mar 19 12:18:31 cidomo kernel: pid 694 (squid), uid 100: exited on signal 6
Mar 19 12:18:31 cidomo squid[661]: Squid Parent: child process 694 exited
due to signal 6
Mar 19 12:18:31 cidomo squid[661]: Exiting due to repeated, frequent
failures

something wrong with squid.
and i can't su from root user to another non root user
n the worst thing is if i add some user again, that new user can't login
from anywhere even if from local console


# su user
su: /bin/csh: Permission denied
#

pls help..

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