diff --git a/datamodels/2.x/itop-oauth-client/datamodel.itop-oauth-client.xml b/datamodels/2.x/itop-oauth-client/datamodel.itop-oauth-client.xml
index 56bab8392..b934aba00 100644
--- a/datamodels/2.x/itop-oauth-client/datamodel.itop-oauth-client.xml
+++ b/datamodels/2.x/itop-oauth-client/datamodel.itop-oauth-client.xml
@@ -230,6 +230,7 @@ HTML
             $this->Set('refresh_token', $oAccessToken->getRefreshToken());
         }
         $this->Set('status', 'active');
+        $this->AllowWrite();
         $this->DBUpdate();
     }
             ]]></code>
diff --git a/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php b/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php
index a786290d4..723fc189d 100644
--- a/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php
+++ b/datamodels/2.x/itop-oauth-client/src/Controller/AjaxOauthClientController.php
@@ -11,6 +11,7 @@ use Combodo\iTop\Application\TwigBase\Controller\Controller;
 use Combodo\iTop\Core\Authentication\Client\OAuth\OAuthClientProviderFactory;
 use Dict;
 use IssueLog;
+use League\OAuth2\Client\Provider\Exception\IdentityProviderException;
 use MetaModel;
 use utils;
 use WebPage;
@@ -65,13 +66,15 @@ class AjaxOauthClientController extends Controller
 			}
 			if (isset($aQuery['code'])) {
 				$sCode = $aQuery['code'];
-				$oAccessToken = OAuthClientProviderFactory::GetAccessTokenFromCode($oOAuthClient, $sCode);
-
-				$oOAuthClient->SetAccessToken($oAccessToken);
-
-
-
-				$aResult['status'] = 'success';
+				try {
+					$oAccessToken = OAuthClientProviderFactory::GetAccessTokenFromCode($oOAuthClient, $sCode);
+					$oOAuthClient->SetAccessToken($oAccessToken);
+					$aResult['status'] = 'success';
+				}
+				catch (IdentityProviderException $e) {
+					$aResult['status'] = 'error';
+					$aResult['error_description'] = $e->getMessage();
+				}
 			}
 		} else {
 			$aResult['status'] = 'error';
diff --git a/setup/backup.class.inc.php b/setup/backup.class.inc.php
index 9b38db6b8..0a5dc7c98 100644
--- a/setup/backup.class.inc.php
+++ b/setup/backup.class.inc.php
@@ -358,6 +358,7 @@ class DBBackup
 
 		$sPortOption = self::GetMysqliCliSingleOption('port', $this->iDBPort);
 		$sTlsOptions = self::GetMysqlCliTlsOptions($this->oConfig);
+		$sProtocolOption = self::GetMysqlCliTransportOption($this->sDBHost);
 
 		$sMysqlVersion = CMDBSource::GetDBVersion();
 		$bIsMysqlSupportUtf8mb4 = (version_compare($sMysqlVersion, self::MYSQL_VERSION_WITH_UTF8MB4_IN_PROGRAMS) === -1);
@@ -378,8 +379,8 @@ EOF;
 
 			// Note: opt implicitely sets lock-tables... which cancels the benefit of single-transaction!
 			//       skip-lock-tables compensates and allows for writes during a backup
-			$sCommand = "$sMySQLDump --defaults-extra-file=\"$sMySQLDumpCnfFile\" --opt --skip-lock-tables --default-character-set=".$sMysqldumpCharset." --add-drop-database --single-transaction --host=$sHost $sPortOption --user=$sUser $sTlsOptions --result-file=$sTmpFileName $sDBName $sTables 2>&1";
-			$sCommandDisplay = "$sMySQLDump --defaults-extra-file=\"$sMySQLDumpCnfFile\" --opt --skip-lock-tables --default-character-set=".$sMysqldumpCharset." --add-drop-database --single-transaction --host=$sHost $sPortOption --user=xxxxx $sTlsOptions --result-file=$sTmpFileName $sDBName $sTables";
+			$sCommand = "$sMySQLDump --defaults-extra-file=\"$sMySQLDumpCnfFile\" --opt --skip-lock-tables --default-character-set=".$sMysqldumpCharset." --add-drop-database --single-transaction --host=$sHost $sPortOption $sProtocolOption --user=$sUser $sTlsOptions --result-file=$sTmpFileName $sDBName $sTables 2>&1";
+			$sCommandDisplay = "$sMySQLDump --defaults-extra-file=\"$sMySQLDumpCnfFile\" --opt --skip-lock-tables --default-character-set=".$sMysqldumpCharset." --add-drop-database --single-transaction --host=$sHost $sPortOption $sProtocolOption --user=xxxxx $sTlsOptions --result-file=$sTmpFileName $sDBName $sTables";
 
 		// Now run the command for real
 		$this->LogInfo("backup: generate data file with command: $sCommandDisplay");
@@ -576,6 +577,24 @@ EOF;
 		return ' --'.$sCliArgName.'='.self::EscapeShellArg($sData);
 	}
 
+	/**
+	 * @param string $sHost
+	 *
+	 * @return string .
+
+	 * @since 2.7.9 3.0.4 3.1.1 N°6123
+	 */
+	public static function GetMysqlCliTransportOption(string $sHost)
+	{
+		$sTransportOptions = '';
+		
+		if($sHost === 'localhost'){
+			$sTransportOptions = '--protocol=tcp';
+		}
+
+		return $sTransportOptions;
+	}
+
 	/**
 	 * @return string the command to launch mysqldump (without its params)
 	 */
diff --git a/sources/Core/Authentication/Client/OAuth/OAuthClientProviderFactory.php b/sources/Core/Authentication/Client/OAuth/OAuthClientProviderFactory.php
index 66230eb3e..77006d436 100644
--- a/sources/Core/Authentication/Client/OAuth/OAuthClientProviderFactory.php
+++ b/sources/Core/Authentication/Client/OAuth/OAuthClientProviderFactory.php
@@ -74,6 +74,7 @@ class OAuthClientProviderFactory
 	 * @return AccessTokenInterface
 	 * @throws \ArchivedObjectException
 	 * @throws \CoreException
+	 * @throws \League\OAuth2\Client\Provider\Exception\IdentityProviderException
 	 */
 	public static function GetAccessTokenFromCode(OAuthClient $oOAuthClient, $sCode)
 	{
@@ -109,7 +110,7 @@ class OAuthClientProviderFactory
 	/**
 	 * @param \DBObject $oOAuthClient
 	 *
-	 * @return mixed
+	 * @return OAuthClientProviderAbstract
 	 * @throws \ArchivedObjectException
 	 * @throws \CoreException
 	 */