MySQL connection error: (# 2002) 'Cannot assign requested address'

Stack trace:
[ 0] __construct()  @  /modules/banners/models/MBanners.php[371]
[ 1] obtPopups(popup-publico)  @  /modules/banners/models/MBanners.php[0]
[ 2] call_user_func_array(banners\MBanners::obtPopups, {Array( [0] => popup-publico)})  @  /base/zfx/activex-tools/ModelHandler.php[162]
[ 3] scall(banners, banners, obtPopups, {Array( [0] => popup-publico)})  @  /modules/banners/models/MBanners.php[381]
[ 4] popupToShow(popup-publico)  @  /modules/banners/models/MBanners.php[0]
[ 5] call_user_func_array(banners\MBanners::popupToShow, {Array( [0] => popup-publico)})  @  /base/zfx/activex-tools/ModelHandler.php[162]
[ 6] scall(banners, banners, popupToShow, {Array( [0] => popup-publico)})  @  /modules/index/controllers/Index.php[243]
[ 7] index()  @  /modules/index/controllers/Index.php[48]
[ 8] _main()  @  /index.php[197]