Andras Kovi commented on ZOOKEEPER-805:

Hi, I'm new to Zookeeper but stumbled upon this bug too. The solution is to add 
the -q1 parameter to nc.

The reason is that by default nc closes the connection as soon as the stdin 
closes. With -q1 you can override this behavior.

Hope this helps.

> four letter words fail with latest ubuntu nc.openbsd
> ----------------------------------------------------
>                 Key: ZOOKEEPER-805
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-805
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.3.1, 3.4.0
>            Reporter: Patrick Hunt
>            Priority: Critical
>             Fix For: 3.3.2, 3.4.0
> In both 3.3 branch and trunk "echo stat|nc localhost 2181" fails against the 
> ZK server on Ubuntu Lucid Lynx.
> I noticed this after upgrading to lucid lynx - which is now shipping openbsd 
> nc as the default:
> OpenBSD netcat (Debian patchlevel 1.89-3ubuntu2)
> vs nc traditional
> [v1.10-38]
> which works fine. Not sure if this is a bug in us or nc.openbsd, but it's 
> currently not working for me. Ugh.

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