The Magento software and component repository, repo.magento.com, recently started requiring Transport Layer Security (TLS) 1.1 or later.
The PCI Security Standards Council} removed SSL/TLS 1.0 as an example of strong cryptography from the PCI Data Security Standard (PCI DSS) version 3.1, stating that it can no longer be used as a security control after June 30, 2016.
For details, see Date Change for Migrating from SSL and Early TLS.
If you have an earlier version of TLS, you'll see the errors discussed in this section.
The following error displays if you attempt to run composer create-project to get a Magento metapackage:
[Composer\Downloader\TransportException]
The "https://repo.magento.com/packages.json" file could not be downloaded: Failed to enable crypto
failed to open stream: operation failed
Actions like saving your authentication credentials or synchronizing with Magento Marketplace fail with the following error:
