Gitlab private repository via composer

Today I have created private repository in gitlab and want to install it via composer in my laravel project, but when I run composer update I am getting the following error

Your configuration does not allow connections to ...........

Here is a part of my composer.json

"repositories": [{
        "type": "package",
        "package": {
            "name": "abc/def",
            "version": "dev-master",
            "type": "package",
            "source": {
                "url": "http://gitlab.abc.pro/abc/def",
                "type": "git",
                "reference": "master"
            },
        }
    } ],
"require": {
        "php": ">=5.5.9",
        "laravel/framework": "5.1.*",
        "abc/def" : "dev-master",  
    },