Pip Install – SSL Error: Certificate_Verify_Failed

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If you are trying to install some Python package using the pip install command and pip fails to verify the SSL certificate, you may receive the error as follows:

Could not fetch URL https://pypi.org/…/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host=’pypi.org’, port=443): Max retries exceeded with url: /…/ (Caused by SSLError(SSLCertVerificationError(1, ‘[ SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: … – skipping

If there is a problem with confirming the SSL certificate of a repository, you can add it as a --trusted-host that will make pip ignore the SSL certificate check for this repository. (more…)

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Disable IPv6 on Linux – Ubuntu, Debian, CentOS

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To disable IPv6 on Linux it is required to modify Linux kernel parameters.

IPv6 can be temporary disabled at runtime, using sysctl command or it can be disabled permanently using either sysctl configuration file or the required kernel parameters can be passed at boot time using GRUB configuration.

In this note i am showing how to disable IPv6 temporary or permanently on Ubuntu, Debian, CentOS and similar Linux operating systems. (more…)

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Windows: Zip | Unzip – Command Line

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In the past it was not possible to create Zip files and Unzip archives in Windows without installing third-party programs like WinZip and 7-Zip.

But now Windows has a built-in capability to Zip files and folders and Unzip archives from the command line using PowerShell.

Starting from Windows 8 with PowerShell 3.0 and .NET Framework 4.5 installed by default, it is possible to use a kind of zip and unzip commands from the command line. (more…)

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Git – Show Config – List Global & Local Settings

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Git stores configuration data in three different scopes: local, global and system.

Using the git config command we can list all Git config settings as well as only local, global or system settings.

For each scope, Git stores settings in different config files and it may be useful to know how to locate those files.

In this note i am showing how to list Git config settings and how to find Git config files location. (more…)

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Windows: Install Telnet Client – CMD & PowerShell

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The telnet client in Windows is disabled by default.

Before using the telnet command in Windows it is needed to enable the telnet client, otherwise you’ll get a result similar to the below messages:

CMD: ‘telnet’ is not recognized as an internal or external command, operable program or batch file.

PowerShell: The term ‘telnet’ is not recognized as the name of a cmdlet, function, script file, or operable program.

In this note i am showing how to install the telnet client via the Windows CMD & PowerShell and how to use the telnet command to watch the Star Wars movie on the command prompt. (more…)

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