diff --git a/apps/files_external/js/settings.js b/apps/files_external/js/settings.js
index 96b56d221c..ceacbf4afa 100644
--- a/apps/files_external/js/settings.js
+++ b/apps/files_external/js/settings.js
@@ -859,6 +859,9 @@ MountConfigListView.prototype = _.extend({
 				var input = $(this);
 				var val = storageConfig.backendOptions[input.data('parameter')];
 				if (val !== undefined) {
+					if(input.is('input:checkbox')) {
+						input.prop('checked', val);
+					}
 					input.val(storageConfig.backendOptions[input.data('parameter')]);
 					highlightInput(input);
 				}
diff --git a/apps/files_external/lib/storageconfig.php b/apps/files_external/lib/storageconfig.php
index 42c515f467..ef859e8ae8 100644
--- a/apps/files_external/lib/storageconfig.php
+++ b/apps/files_external/lib/storageconfig.php
@@ -211,6 +211,20 @@ class StorageConfig implements \JsonSerializable {
 	 * @param array $backendOptions backend options
 	 */
 	public function setBackendOptions($backendOptions) {
+		if($this->getBackend() instanceof  Backend) {
+			$parameters = $this->getBackend()->getParameters();
+			foreach($backendOptions as $key => $value) {
+				if(isset($parameters[$key])) {
+					switch ($parameters[$key]->getType()) {
+						case \OCA\Files_External\Lib\DefinitionParameter::VALUE_BOOLEAN:
+							$value = (bool)$value;
+							break;
+					}
+					$backendOptions[$key] = $value;
+				}
+			}
+		}
+
 		$this->backendOptions = $backendOptions;
 	}
 
diff --git a/apps/files_external/tests/storageconfigtest.php b/apps/files_external/tests/storageconfigtest.php
index d7f8d2b4d7..60ec14dd08 100644
--- a/apps/files_external/tests/storageconfigtest.php
+++ b/apps/files_external/tests/storageconfigtest.php
@@ -30,6 +30,17 @@ class StorageConfigTest extends \Test\TestCase {
 		$backend = $this->getMockBuilder('\OCA\Files_External\Lib\Backend\Backend')
 			->disableOriginalConstructor()
 			->getMock();
+		$parameter = $this->getMockBuilder('\OCA\Files_External\Lib\DefinitionParameter')
+			->disableOriginalConstructor()
+			->getMock();
+		$parameter
+			->expects($this->once())
+			->method('getType')
+			->willReturn(1);
+		$backend
+			->expects($this->once())
+			->method('getParameters')
+			->willReturn(['secure' => $parameter]);
 		$backend->method('getIdentifier')
 			->willReturn('storage::identifier');
 
@@ -43,7 +54,7 @@ class StorageConfigTest extends \Test\TestCase {
 		$storageConfig->setMountPoint('test');
 		$storageConfig->setBackend($backend);
 		$storageConfig->setAuthMechanism($authMech);
-		$storageConfig->setBackendOptions(['user' => 'test', 'password' => 'password123']);
+		$storageConfig->setBackendOptions(['user' => 'test', 'password' => 'password123', 'secure' => '1']);
 		$storageConfig->setPriority(128);
 		$storageConfig->setApplicableUsers(['user1', 'user2']);
 		$storageConfig->setApplicableGroups(['group1', 'group2']);
@@ -51,16 +62,17 @@ class StorageConfigTest extends \Test\TestCase {
 
 		$json = $storageConfig->jsonSerialize();
 
-		$this->assertEquals(1, $json['id']);
-		$this->assertEquals('/test', $json['mountPoint']);
-		$this->assertEquals('storage::identifier', $json['backend']);
-		$this->assertEquals('auth::identifier', $json['authMechanism']);
-		$this->assertEquals('test', $json['backendOptions']['user']);
-		$this->assertEquals('password123', $json['backendOptions']['password']);
-		$this->assertEquals(128, $json['priority']);
-		$this->assertEquals(['user1', 'user2'], $json['applicableUsers']);
-		$this->assertEquals(['group1', 'group2'], $json['applicableGroups']);
-		$this->assertEquals(['preview' => false], $json['mountOptions']);
+		$this->assertSame(1, $json['id']);
+		$this->assertSame('/test', $json['mountPoint']);
+		$this->assertSame('storage::identifier', $json['backend']);
+		$this->assertSame('auth::identifier', $json['authMechanism']);
+		$this->assertSame('test', $json['backendOptions']['user']);
+		$this->assertSame('password123', $json['backendOptions']['password']);
+		$this->assertSame(true, $json['backendOptions']['secure']);
+		$this->assertSame(128, $json['priority']);
+		$this->assertSame(['user1', 'user2'], $json['applicableUsers']);
+		$this->assertSame(['group1', 'group2'], $json['applicableGroups']);
+		$this->assertSame(['preview' => false], $json['mountOptions']);
 	}
 
 }
diff --git a/lib/private/files/storage/dav.php b/lib/private/files/storage/dav.php
index a6e77e1b23..5e00a03ebb 100644
--- a/lib/private/files/storage/dav.php
+++ b/lib/private/files/storage/dav.php
@@ -136,9 +136,13 @@ class DAV extends Common {
 			'password' => $this->password,
 		);
 
+		$proxy = \OC::$server->getConfig()->getSystemValue('proxy', '');
+		if($proxy !== '') {
+			$settings['proxy'] = $proxy;
+		}
+
 		$this->client = new Client($settings);
 		$this->client->setThrowExceptions(true);
-
 		if ($this->secure === true && $this->certPath) {
 			$this->client->addCurlSetting(CURLOPT_CAINFO, $this->certPath);
 		}