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I am getting the below error after doing an upgrade when trying to log in to the BO. 

The front end shows a 500 error.

Initially I did the upgrade using 1click upgrade and that broke the site with a 500 error. I then tried to do an upgrade using Plesk and recieved the below. 

Can anyone please help?  




Link to database cannot be established:SQLSTATE[HY000] [2002] php_network_getaddresses: getaddrinfo failed: Name or service not known
at line 102 in file classes/db/DbPDO.php

97.     public function connect()
98.     {
99.         try {
100.             $this->link = $this->_getPDO($this->server, $this->user, $this->password, $this->database, 5);
101.         } catch (PDOException $e) {
102.             throw new PrestaShopException('Link to database cannot be established:'.$e->getMessage());
103.         }
105.         // UTF-8 support
106.         if ($this->link->exec('SET NAMES \'utf8\'') === false) {
107.             throw new PrestaShopException('PrestaShop Fatal error: no utf-8 support. Please check your server configuration.');

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This error has been reported on many occasions, but unfortunately until now the developers team was unable to reproduce it, let alone correct it.

I don't know if that helps, but you can try the following:

  1. Open /app/config/parameters.php

Change line 4 (first line of the array)

'database_host' => '',


'database_host' => 'localhost',

If the error message reappears you should check if the database settings shown in this file are really the same like before the upgrade.

Notice (If you upgraded from 1.6x): You will find the settings of PrestaShop 1.6 slightly different coded  in /config/settings.inc.php


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