Managing and using network connectivity on a Ubuntu system

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What is an origin and solution for “port 9000: Connection refused” error?

I am stuggeling with port 9000: Connection refused error. I work on Ubuntu 14.04 and faced the problem when trying to run Hadoop in a non-distributed mode, as a single Java process (compare Hadoop ...
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Ethernet Connection randomly disconnects after transmit queue 0 timed out

Description of problem: Ethernet connection gets disconnected at random apparently without any reason. I have tried the following command to restart my ethernet connection, sudo service ...
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How do I setup a tunnel piercing scenario on my Ubuntu client to access the internet through my own server including port knocking on it?

Google isn't my friend with this long term issue which is up to date for my upcoming holidays again. It would be great if you could provide a road warrior setup for DNS as well as IP tunneling as a ...