A few ideas:

1. Bind netcat to a port and connect your script to it to see whether stuff
is really being sent.
2. Maybe you should write "\r", "\n" or "\r\n" after "MARK START".
3. Maybe firewall is blocking you.
--
Greg Navis
I help tech companies to scale Heroku-hosted Rails apps.
Free, biweekly scalability newsletter for SaaS CEOs
<http://www.gregnavis.com/newsletter/>

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