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/etc/security/limits.conf で nofile を unlimited に設定すると could not open session メッセージが表示される

Solution Verified - Updated 2015-07-10T07:21:37+00:00 -

Issue

nofile を /etc/security/limits.conf の unlimited に設定すると、ユーザーがログインできません。
```
user  soft nofile 1024
user  hard nofile unlimited

# su - user
could not open session
```

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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