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i think that, if you can add some log for this framework....
so we can debug it...

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did you find where the problem was ? I got the same issue ...

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Empty result with ubuntu 14.04 too.

I believe it's a netcat issue, which exit too soon on network input EOF
Related bug: https://bugs.launchpad.net/ubuntu/+source/netcat-openbsd/+bug/544935

A dirty workaround:
Add -q -1 for 1st and 3rd nc command
So it will keep forwarding data until pipe on the other end was broken

1st: the one listening on remote node:8193 to receive work data; 
2nd: listening on remote node:8192 to send back processed data
3rd: retrieving processed data from remote node:8192
4th: sending work data to remote node:8193

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I have hit the same issue and fixed it by doing

sudo apt-get remove netcat-openbsd

and then

sudo apt-get install netcat-traditional

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None of the proposed suggestions worked for me (CentOS). However, I found that nc6 works like a charm. After downloading and installing, you should change the br script to use nc6 instead of nc.

Link to nc6 source: https://web.archive.org/web/20070813000522/http://ftp.deepspace6.net/pub/ds6/sources/nc6/nc6-1.0.tar.gz

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