Sabre\DAV\Exception: Unknown error while seeking content. (Error occuring in remote.php, catching exception and error)

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Nextcloud version (eg, 20.0.5): Nextcloud Hub 6 (27.1.0)
Operating system and version (eg, Ubuntu 20.04): Ubuntu 22.04.3 LTS
Apache or nginx version (eg, Apache 2.4.25): 2.4.52-1ubuntu4.6
PHP version (eg, 7.4): 8.1.2-1ubuntu2.14 (cli)

The issue you are facing:
I’m seeing this error occurring often, five, ten or more times a day, almost every day. Nextcloud seems to be working fine though, syncing without errors and with no other problems.

Is this the first time you’ve seen this error? (Y/N): N

Steps to replicate it:

  1. No steps: I’ve searched the web and this forum and not found a similar problem. I have no idea what’s causing it or where to start troubleshooting.

The output of your Nextcloud log in Admin > Logging:

Error	webdav	Sabre\DAV\Exception: Unknown error while seeking content
    /var/www/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php - line 129:
    /var/www/nextcloud/apps/dav/lib/BulkUpload/BulkUploadPlugin.php - line 71:
    /var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
    /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 472:
    /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 253:
    /var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 321:
    /var/www/nextcloud/apps/dav/lib/Server.php - line 365:
    /var/www/nextcloud/apps/dav/appinfo/v2/remote.php - line 35:
    /var/www/nextcloud/remote.php - line 172:
    require_once("/var/www/ne ... p")

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'instanceid' => '*******',
  'passwordsalt' => '*******',
  'secret' => '*******',
  'trusted_domains' => 
  array (
    0 => 'XXX.XXX.XXX.XXX',
    1 => '*******.COM',
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '',
  'overwrite.cli.url' => 'http://XXX.XXX.XXX.XXX',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '*******',
  'installed' => true,
  'mail_from_address' => '*******',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => '*******.com',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '*******.com',
  'mail_smtpport' => '465',
  'mail_smtpname' => '*******.com',
  'mail_smtppassword' => '*******',
  'mail_smtpsecure' => 'ssl',
  'default_phone_region' => 'US',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'localhost',
    'port' => 6379,
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,

The output of your Apache/nginx/system log in /var/log/____:

Not sure which log file this refers to. There are many logs at /var/log/apache: access, error, nextcloud_access, nextcloud_error, and other_vhosts_access.

Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.

    /var/www/nextcloud/remote.php - line 172:
    require_once("/var/www/ne ... p")

AND FINALLY, here is a snippet of the remote.php log referenced in error above, lines 172-177:

        $baseuri = OC::$WEBROOT . '/remote.php/'.$service.'/';
        require_once $file;
} catch (Exception $ex) {
} catch (Error $e) {

Try these Search results for 'Sabre\DAV\Exception: Unknown error while seeking content' - Nextcloud community

And on github `Sabre\DAV\Exception` `Unknown error while seeking content` upload error leads to client freeze · Issue #30424 · nextcloud/server · GitHub

See above.

Thanks for the reply, just! I’ve read those, and while they share the Sabre\DAV\Exception, they differ as to the actual error. And as I said, my instance is syncing fine. Clients are all behaving fine. I just keep seeing that annoying error, and would like to solve it.

You posted the error, but there should be a transaction - presumably a POST - immediately before the error. That will tell you the client request and details (IP address, client software) triggering the error condition.

Thanks for that info, jtr. I assume you mean that I didn’t post full remote.php file, and not the Nextcloud log? Because I did post the log at top of the page. I’ll include the complete remote.php below. I’ve read it over and can’t see anything obvious, but I admit it’s over my pay grade.

    require_once __DIR__ . '/lib/versioncheck.php';
    use OCA\DAV\Connector\Sabre\ExceptionLoggerPlugin;
    use Sabre\DAV\Exception\ServiceUnavailable;
    use Sabre\DAV\Server;
    use Psr\Log\LoggerInterface;
     * Class RemoteException
     * Dummy exception class to be use locally to identify certain conditions
     * Will not be logged to avoid DoS
    class RemoteException extends Exception {
     * @param Exception|Error $e
    function handleException($e) {
            try {
                    $request = \OC::$server->getRequest();
                    // in case the request content type is text/xml - we assume it's a WebDAV request
                    $isXmlContentType = strpos($request->getHeader('Content-Type'), 'text/xml');
                    if ($isXmlContentType === 0) {
                            // fire up a simple server to properly process the exception
                            $server = new Server();
                            if (!($e instanceof RemoteException)) {
                                    // we shall not log on RemoteException
                                    $server->addPlugin(new ExceptionLoggerPlugin('webdav', \OC::$server->get(LoggerInterface::class)));
                            $server->on('beforeMethod:*', function () use ($e) {
                                    if ($e instanceof RemoteException) {
                                            switch ($e->getCode()) {
                                                    case 503:
                                                            throw new ServiceUnavailable($e->getMessage());
                                                    case 404:
                                                            throw new \Sabre\DAV\Exception\NotFound($e->getMessage());
                                    $class = get_class($e);
                                    $msg = $e->getMessage();
                                    throw new ServiceUnavailable("$class: $msg");
                    } else {
                            $statusCode = 500;
                            if ($e instanceof \OC\ServiceUnavailableException) {
                                    $statusCode = 503;
                            if ($e instanceof RemoteException) {
                                    // we shall not log on RemoteException
                                    OC_Template::printErrorPage($e->getMessage(), '', $e->getCode());
                            } else {
                                    \OC::$server->get(LoggerInterface::class)->error($e->getMessage(), ['app' => 'remote','exception' => $e]);
                                    OC_Template::printExceptionErrorPage($e, $statusCode);
            } catch (\Exception $e) {
                    OC_Template::printExceptionErrorPage($e, 500);
     * @param $service
     * @return string
    function resolveService($service) {
            $services = [
                    'webdav' => 'dav/appinfo/v1/webdav.php',
                    'dav' => 'dav/appinfo/v2/remote.php',
                    'caldav' => 'dav/appinfo/v1/caldav.php',
                    'calendar' => 'dav/appinfo/v1/caldav.php',
                    'carddav' => 'dav/appinfo/v1/carddav.php',
                    'contacts' => 'dav/appinfo/v1/carddav.php',
                    'files' => 'dav/appinfo/v1/webdav.php',
                    'direct' => 'dav/appinfo/v2/direct.php',
            if (isset($services[$service])) {
                    return $services[$service];
            return \OC::$server->getConfig()->getAppValue('core', 'remote_' . $service);
    try {
            require_once __DIR__ . '/lib/base.php';
            // All resources served via the DAV endpoint should have the strictest possible
            // policy. Exempted from this is the SabreDAV browser plugin which overwrites
            // this policy with a softer one if debug mode is enabled.
            header("Content-Security-Policy: default-src 'none';");
            if (\OCP\Util::needUpgrade()) {
                    // since the behavior of apps or remotes are unpredictable during
                    // an upgrade, return a 503 directly
                    throw new RemoteException('Service unavailable', 503);
            $request = \OC::$server->getRequest();
            $pathInfo = $request->getPathInfo();
            if ($pathInfo === false || $pathInfo === '') {
                    throw new RemoteException('Path not found', 404);
            if (!$pos = strpos($pathInfo, '/', 1)) {
                    $pos = strlen($pathInfo);
            $service = substr($pathInfo, 1, $pos - 1);
            $file = resolveService($service);
            if (is_null($file)) {
                    throw new RemoteException('Path not found', 404);
            $file = ltrim($file, '/');
            $parts = explode('/', $file, 2);
            $app = $parts[0];
            // Load all required applications
            \OC::$REQUESTEDAPP = $app;
            OC_App::loadApps(['filesystem', 'logging']);
            switch ($app) {
                    case 'core':
                            $file = OC::$SERVERROOT .'/'. $file;
                            if (!\OC::$server->getAppManager()->isInstalled($app)) {
                                    throw new RemoteException('App not installed: ' . $app);
                            $file = OC_App::getAppPath($app) .'/'. $parts[1];
            $baseuri = OC::$WEBROOT . '/remote.php/'.$service.'/';
            require_once $file;
    } catch (Exception $ex) {
    } catch (Error $e) {

As I implied in my last post, this in the weeds stuff is beyond me. But I’m reading up, checking the documentation, trying to catch a clue.

I’m wondering if the biggest clue isn’t contained right in the log entries:
Sabre\DAV\Exception: Unknown error while seeking content.

I do not think I ever installed any packages that might have enabled sabre\dav, I have not created a sabre\dav server. I do not see any directory anywhere for it.

I am using and sharing files for all my users on external storage, and I see a setting on the admin page for External Storage to “Allow users to mount external storage”, but I do not have the WebDAV option ticked or enabled. I only have the Nextcloud option enabled.

I might be barking up a totally wrong tree, but possibly this will mean something to someone here.

ADDING: And then there’s this, at the top of my remote.php file (posted above):

use Sabre\DAV\Exception\ServiceUnavailable;

I don’t know if this means anything, but I discovered I can connect to my external storage via webDAV from my Mac desktop “Go > Connect to Server.”

I still have no solution to why this happened…BUT: the good news for me is that the error has stopped occurring.

I did find and correct a problem with one of the clients, where some files had failed to sync due to being named with leading/trailing spaces. They had been stuck there, prevented from syncing for maybe six weeks. Since I renamed those files, I haven’t seen the error again.

Even though I don’t understand what connection there might be between the two, I’m hoping I’ve seen the last of that error. And so I am marking this question as solved.