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Bug#335476: nscd: Caches old IP-address

* Dave Love:

> Yes, please turn off the default persistent caching of hosts (at
> least).  I think this should also be done upstream.  It can lead to
> lockout of logins in an obscure fashion -- at least it did on Fedora
> systems running what appears to be the same version of nscd with the
> same defaults, so presumably Debian would be subject to the same
> lossage.

The current code tries to honor TTLs.  It might be sufficient to set a
zero (or very low) TTL for entries coming from /etc/hosts.

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