problem with composer on magento 2

Question

I want to setup new extension with composer on magento2 and I get this error:

[Composer\Downloader\TransportException]
Invalid credentials for 'https://repo.magento.com/packages.json', aborting.

I use public key and private key as user and password ( get key from marketplace.magento.com )

I use this comment for install new extension:

composer require mageplaza/composer require mageplaza/magento-2-seo-extension

Answer 1

I want you to try two things:

1. Do you have more than one pair of public and private key enabled? If yes then try by enabling just one and disable all else.

2. Create auth.json:

   To create auth.json:

   • Log in to your Magento server as, or switch to, the Magento file system owner.

   • Edit or create auth.json in the user’s home directory.

     The following example shows how to add repo.magento.com authentication to an existing file:

{
   "github-oauth": {
     "github.com": "<your github oauth id>"
   },
   "http-basic": {
      "repo.magento.com": {
         "username": "<public key>",
         "password": "<private key>"
      }
   }
}

Source: http://devdocs.magento.com/guides/v2.0/install-gde/prereq/dev_install.html#create-authjson

Answer 2

TLDR; => enter public key as Username and private key as Password

I get here with similar problem / refresh topic. I want to try install magento first time. Following this start guide

Using this composer command give me auth error:

create-project --repository-url=https://repo.magento.com/ magento/project-community-edition <install-directory-name>

I registered to magento and i generate Api keys. But composer command was prompt for username so i try my user name which Magento generate for me, i tried my username and this public key and all this attempts ends with auth error.

Finnally i tried paste public key as Username and private key as Password and it works like a charm : )

Hope i help somebody