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

Stack trace:
[ 0] __construct({Array( [idServicio] => 9999/1421 [dbHost] => 18...})  @  /base/zfx/data-model/Model.php[102]
[ 1] __construct(confidatosempresa, {Array( [idServicio] => 9999/1421 [dbHost] => 18...})  @  /models/my/ModeloBase.php[27]
[ 2] __construct(confidatosempresa, {Array( [idServicio] => 9999/1421 [dbHost] => 18...})  @  /modules/conf/models/MConfidatosempresa.php[40]
[ 3] __construct(1, {Array( [idServicio] => 9999/1421 [dbHost] => 18...})  @  /modules/conf/models/MConfidatosempresa.php[644]
[ 4] getData(1, {Array( [idServicio] => 9999/1421 [dbHost] => 18...})  @  /controllers/abstract/ControllerBase.php[380]
[ 5] findLang()  @  /views/app/section-js-vars.php[19]
[ 6] require(/var/www/vhosts/viajesturiopolis.es/httpdocs/views/app/section-js-vars.php)  @  /base/zfx/core/View.php[382]
[ 7] showSection(app/section-js-vars)  @  /views/klorofil/common/head.php[23]
[ 8] require(/var/www/vhosts/viajesturiopolis.es/httpdocs/views/klorofil/common/head.php)  @  /base/zfx/core/View.php[382]
[ 9] showSection(/var/www/vhosts/viajesturiopolis.es/httpdocs/views/klorofil/common/head.php)  @  /views/klorofil/common/tplError.php[24]
[10] require(/var/www/vhosts/viajesturiopolis.es/httpdocs/views/klorofil/common/tplError.php)  @  /base/zfx/core/View.php[225]
[11] show()  @  /base/zfx/message-errors/MessageErrors.php[22]
[12] showError(/klorofil/common/tplError, 403, {Array( [title] => Error en el Token [message] =...})  @  /controllers/abstract/ControllerBase.php[275]
[13] loadConnection()  @  /controllers/abstract/ControllerBase.php[70]
[14] __construct()  @  /controllers/abstract/PermissionBase.php[31]
[15] __construct(, )  @  /controllers/abstract/ScopeBase.php[35]
[16] __construct(, )  @  /controllers/abstract/PublicBase.php[45]
[17] __construct(index)  @  /modules/index/controllers/Index.php[23]
[18] __construct()  @  /index.php[190]