diff --git a/lib/private/files/storage/dav.php b/lib/private/files/storage/dav.php
index df0f4c7e91d2..baf00f42d481 100644
--- a/lib/private/files/storage/dav.php
+++ b/lib/private/files/storage/dav.php
@@ -47,7 +47,6 @@
 use OCP\Files\StorageNotAvailableException;
 use OCP\Util;
 use Sabre\DAV\Client;
-use Sabre\DAV\Exception\NotFound;
 use Sabre\DAV\Xml\Property\ResourceType;
 use Sabre\HTTP\ClientException;
 use Sabre\HTTP\ClientHttpException;
@@ -203,8 +202,10 @@ public function opendir($path) {
 				array(),
 				1
 			);
-			$id = md5('webdav' . $this->root . $path);
-			$content = array();
+			if ($response === false) {
+				return false;
+			}
+			$content = [];
 			$files = array_keys($response);
 			array_shift($files); //the first entry is the current directory
 
@@ -221,13 +222,6 @@ public function opendir($path) {
 				$content[] = $file;
 			}
 			return IteratorDirectory::wrap($content);
-		} catch (ClientHttpException $e) {
-			if ($e->getHttpStatus() === 404) {
-				$this->statCache->clear($path . '/');
-				$this->statCache->set($path, false);
-				return false;
-			}
-			$this->convertException($e, $path);
 		} catch (\Exception $e) {
 			$this->convertException($e, $path);
 		}
@@ -242,17 +236,13 @@ public function opendir($path) {
 	 *
 	 * @param string $path path to propfind
 	 *
-	 * @return array propfind response
+	 * @return array|boolean propfind response or false if the entry was not found
 	 *
-	 * @throws NotFound
+	 * @throws ClientHttpException
 	 */
 	private function propfind($path) {
 		$path = $this->cleanPath($path);
 		$cachedResponse = $this->statCache->get($path);
-		if ($cachedResponse === false) {
-			// we know it didn't exist
-			throw new NotFound();
-		}
 		// we either don't know it, or we know it exists but need more details
 		if (is_null($cachedResponse) || $cachedResponse === true) {
 			$this->init();
@@ -269,11 +259,15 @@ private function propfind($path) {
 					)
 				);
 				$this->statCache->set($path, $response);
-			} catch (NotFound $e) {
-				// remember that this path did not exist
-				$this->statCache->clear($path . '/');
-				$this->statCache->set($path, false);
-				throw $e;
+			} catch (ClientHttpException $e) {
+				if ($e->getHttpStatus() === 404) {
+					$this->statCache->clear($path . '/');
+					$this->statCache->set($path, false);
+					return false;
+				}
+				$this->convertException($e, $path);
+			} catch (\Exception $e) {
+				$this->convertException($e, $path);
 			}
 		} else {
 			$response = $cachedResponse;
@@ -285,17 +279,15 @@ private function propfind($path) {
 	public function filetype($path) {
 		try {
 			$response = $this->propfind($path);
-			$responseType = array();
+			if ($response === false) {
+				return false;
+			}
+			$responseType = [];
 			if (isset($response["{DAV:}resourcetype"])) {
 				/** @var ResourceType[] $response */
 				$responseType = $response["{DAV:}resourcetype"]->getValue();
 			}
 			return (count($responseType) > 0 and $responseType[0] == "{DAV:}collection") ? 'dir' : 'file';
-		} catch (ClientHttpException $e) {
-			if ($e->getHttpStatus() === 404) {
-				return false;
-			}
-			$this->convertException($e, $path);
 		} catch (\Exception $e) {
 			$this->convertException($e, $path);
 		}
@@ -314,13 +306,7 @@ public function file_exists($path) {
 				return true;
 			}
 			// need to get from server
-			$this->propfind($path);
-			return true; //no 404 exception
-		} catch (ClientHttpException $e) {
-			if ($e->getHttpStatus() === 404) {
-				return false;
-			}
-			$this->convertException($e, $path);
+			return ($this->propfind($path) !== false);
 		} catch (\Exception $e) {
 			$this->convertException($e, $path);
 		}
@@ -425,7 +411,10 @@ public function free_space($path) {
 		$path = $this->cleanPath($path);
 		try {
 			// TODO: cacheable ?
-			$response = $this->client->propfind($this->encodePath($path), array('{DAV:}quota-available-bytes'));
+			$response = $this->client->propfind($this->encodePath($path), ['{DAV:}quota-available-bytes']);
+			if ($response === false) {
+				return FileInfo::SPACE_UNKNOWN;
+			}
 			if (isset($response['{DAV:}quota-available-bytes'])) {
 				return (int)$response['{DAV:}quota-available-bytes'];
 			} else {
@@ -547,15 +536,13 @@ public function copy($path1, $path2) {
 	public function stat($path) {
 		try {
 			$response = $this->propfind($path);
-			return array(
+			if ($response === false) {
+				return [];
+			}
+			return [
 				'mtime' => strtotime($response['{DAV:}getlastmodified']),
 				'size' => (int)isset($response['{DAV:}getcontentlength']) ? $response['{DAV:}getcontentlength'] : 0,
-			);
-		} catch (ClientHttpException $e) {
-			if ($e->getHttpStatus() === 404) {
-				return array();
-			}
-			$this->convertException($e, $path);
+			];
 		} catch (\Exception $e) {
 			$this->convertException($e, $path);
 		}
@@ -566,7 +553,10 @@ public function stat($path) {
 	public function getMimeType($path) {
 		try {
 			$response = $this->propfind($path);
-			$responseType = array();
+			if ($response === false) {
+				return false;
+			}
+			$responseType = [];
 			if (isset($response["{DAV:}resourcetype"])) {
 				/** @var ResourceType[] $response */
 				$responseType = $response["{DAV:}resourcetype"]->getValue();
@@ -579,11 +569,6 @@ public function getMimeType($path) {
 			} else {
 				return false;
 			}
-		} catch (ClientHttpException $e) {
-			if ($e->getHttpStatus() === 404) {
-				return false;
-			}
-			$this->convertException($e, $path);
 		} catch (\Exception $e) {
 			$this->convertException($e, $path);
 		}
@@ -674,6 +659,9 @@ public function getPermissions($path) {
 		$this->init();
 		$path = $this->cleanPath($path);
 		$response = $this->propfind($path);
+		if ($response === false) {
+			return 0;
+		}
 		if (isset($response['{http://owncloud.org/ns}permissions'])) {
 			return $this->parsePermissions($response['{http://owncloud.org/ns}permissions']);
 		} else if ($this->is_dir($path)) {
@@ -690,6 +678,9 @@ public function getETag($path) {
 		$this->init();
 		$path = $this->cleanPath($path);
 		$response = $this->propfind($path);
+		if ($response === false) {
+			return null;
+		}
 		if (isset($response['{DAV:}getetag'])) {
 			return trim($response['{DAV:}getetag'], '"');
 		}
@@ -733,6 +724,13 @@ public function hasUpdated($path, $time) {
 			// force refresh for $path
 			$this->statCache->remove($path);
 			$response = $this->propfind($path);
+			if ($response === false) {
+				if ($path === '') {
+					// if root is gone it means the storage is not available
+					throw new StorageNotAvailableException(get_class($e) . ': ' . $e->getMessage());
+				}
+				return false;
+			}
 			if (isset($response['{DAV:}getetag'])) {
 				$cachedData = $this->getCache()->get($path);
 				$etag = null;
@@ -752,7 +750,7 @@ public function hasUpdated($path, $time) {
 				return $remoteMtime > $time;
 			}
 		} catch (ClientHttpException $e) {
-			if ($e->getHttpStatus() === 404 || $e->getHttpStatus() === 405) {
+			if ($e->getHttpStatus() === 405) {
 				if ($path === '') {
 					// if root is gone it means the storage is not available
 					throw new StorageNotAvailableException(get_class($e) . ': ' . $e->getMessage());