diff --git a/application/startup.inc.php b/application/startup.inc.php
index 8f9ea4dd5..0454e7f63 100644
--- a/application/startup.inc.php
+++ b/application/startup.inc.php
@@ -91,4 +91,10 @@ else
 	$_SESSION['itop_env'] = ITOP_DEFAULT_ENV;
 }
 $sConfigFile = APPCONF.$sEnv.'/'.ITOP_CONFIG_FILE;
-MetaModel::Startup($sConfigFile, false /* $bModelOnly */, $bAllowCache, false /* $bTraceSourceFiles */, $sEnv);
+try {
+    MetaModel::Startup($sConfigFile, false /* $bModelOnly */, $bAllowCache, false /* $bTraceSourceFiles */, $sEnv);
+}
+catch (MySQLException $e) {
+    IssueLog::Debug($e->getMessage());
+    throw new MySQLException('Could not connect to the DB server', []);
+}
\ No newline at end of file
diff --git a/core/counter.class.inc.php b/core/counter.class.inc.php
index eeddc4249..e7fc88985 100644
--- a/core/counter.class.inc.php
+++ b/core/counter.class.inc.php
@@ -188,8 +188,8 @@ final class ItopCounter
 
 		if (!$hDBLink)
 		{
-			throw new Exception("Could not connect to the DB server (host=$sDBHost, user=$sDBUser): ".mysqli_connect_error().' (mysql errno: '.mysqli_connect_errno().')');
-		}
+            throw new MySQLException('Could not connect to the DB server '.mysqli_connect_error().' (mysql errno: '.mysqli_connect_errno(), array('host' => $sDBHost, 'user' => $sDBUser));
+        }
 
 		return $hDBLink;
 	}
diff --git a/core/mutex.class.inc.php b/core/mutex.class.inc.php
index f9580a963..bd6c54d18 100644
--- a/core/mutex.class.inc.php
+++ b/core/mutex.class.inc.php
@@ -257,7 +257,7 @@ class iTopMutex
 		$this->hDBLink = CMDBSource::GetMysqliInstance($sServer, $sUser, $sPwd, $sSource, $bTlsEnabled, $sTlsCA, false);
 
 		if (!$this->hDBLink) {
-			throw new Exception("Could not connect to the DB server (host=$sServer, user=$sUser): ".mysqli_connect_error().' (mysql errno: '.mysqli_connect_errno().')');
+            throw new MySQLException('Could not connect to the DB server '.mysqli_connect_error().' (mysql errno: '.mysqli_connect_errno(), array('host' => $sDBHost, 'user' => $sDBUser));
 		}
 
 		// Make sure that the server variable `wait_timeout` is at least 86400 seconds for this connection,
diff --git a/setup/backup.class.inc.php b/setup/backup.class.inc.php
index edb429961..a7bb9ac70 100644
--- a/setup/backup.class.inc.php
+++ b/setup/backup.class.inc.php
@@ -417,8 +417,8 @@ EOF;
 			if ($oMysqli->connect_errno)
 			{
 				$sHost = is_null($this->iDBPort) ? $this->sDBHost : $this->sDBHost.' on port '.$this->iDBPort;
-				throw new BackupException("Cannot connect to the MySQL server '$sHost' (".$oMysqli->connect_errno.") ".$oMysqli->connect_error);
-			}
+                throw new MySQLException('Could not connect to the DB server '.$oMysqli->connect_errno.' (mysql errno: '.$oMysqli->connect_error, array('host' => $sHost, 'user' => $sUser));
+            }
 			if (!$oMysqli->select_db($this->sDBName))
 			{
 				throw new BackupException("The database '$this->sDBName' does not seem to exist");