Category Archives: Linux

MongoDB – PyMongo error while connecting to a remote server: [Errno 111] Connection refused

If you are trying to connect a remote server (e.g. Linux Ubuntu) via PyMongo, it is probable that you get an error as below: pymongo.errors.ConnectionFailure: [Errno 111] Connection refused In order to resolve this issue, you need to enable external … Continue reading

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How to set your VM to auto start at system startup in VirtualBox 4.2 on Ubuntu 12.04

There is a handy feature in VirtualBox 4.2 that lets you configure your VM to be automatically started every time system starts up. Below you can find the steps needed to configure your VirtualBox installation to achieve that on Ubuntu … Continue reading

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Installing VirtualBox (4.2) and phpVirtualBox (4.2.4) on headless Ubuntu Server (12.04 LTS)

Ubuntu 12.04 LTS Server is a headless server and does not have X-Window, therefore phpVirtualBox is needed to manage VirtualBox. There are two steps covered here in this post; one for instaling Virtualbox 4.2.4 and the other one for installing … Continue reading

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Virtualbox – VBoxManage: error: Adding machine ‘Ubuntu-VM’ to the autostart database failed with VERR_ACCESS_DENIED

In Ubuntu 12.04 LTS, I tried to configure Virtualbox 4.2 to start my VM automatically when the system starts up. However, I got an error message as below after following the instructions in chapter 9.24.1 in Virtualbox User Manual: VBoxManage: … Continue reading

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Installing Python Pefile and UPX on Amazon Linux AMI (Especially for SET)

If your application (e.g. SET) requires python pefile or UPX, you can not install them easily using Yum package manager on Amazon Linux AMI because Amazon’s default repositories do not contain these packages. However, you can install them as described … Continue reading

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