Add External Storage (SFTP) -> Undefined array key "mtime"

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The Basics

  • Nextcloud Server version (e.g., 29.x.x):
    • 30.0.6
  • Operating system and version (e.g., Ubuntu 24.04):
    • Synology DS216+
  • Web server and version (e.g, Apache 2.4.25):
    • Apache 2.4.58
  • PHP version (e.g, 8.3):
    • 8.2.21
  • Is this the first time you’ve seen this error? (Yes / No):
    • yes
  • When did this problem seem to first start?
    • after configuration of external storage

Summary of the issue you are facing:

I can successfully add the external storage (green tick). But when I then try to access the files via the browser, I get the error message “This directory is not available, please check the log files or contact the administrator.”
The following error is reported in the log file

  • Error PHP
    Undefined array key “mtime” at /volume1/web/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#560

  • Error files
    Error Call to a member function getPermissions() on array

Steps to replicate it (hint: details matter!):

  1. Configure external Storage (SFTP)

Log entries

Nextcloud

Fehler	PHP	
Undefined array key "mtime" at /volume1/web/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#560
24.02.2025, 20:07:07	
Fehler	files	
Error Call to a member function getPermissions() on array
24.02.2025, 20:07:06	
Fehler	PHP	
Undefined array key "mtime" at /volume1/web/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#560
24.02.2025, 20:07:06	
Fehler	PHP	
Undefined array key "mtime" at /volume1/web/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#560
24.02.2025, 19:52:54	
Fehler	webdav	
Error Call to a member function getPermissions() on array
24.02.2025, 19:52:54	
Fehler	PHP	
Undefined array key "mtime" at /volume1/web/nextcloud/apps/files_external/lib/Lib/Storage/SFTP.php#560
24.02.2025, 19:52:54	

Configuration

Nextcloud

<?php
$CONFIG = array (
  'instanceid' => '****',
  'passwordsalt' => '****',
  'secret' => '****',
  'trusted_domains' => 
  array (
    0 => '****',
    1 => '****',
    2 => '****',
  ),
  'datadirectory' => '/volume1/nextcloud/data',
  'overwrite.cli.url' => 'http://****/nextcloud',
  'dbtype' => 'mysql',
  'version' => '30.0.6.2',
  'dbname' => 'nextcloud',
  'dbhost' => '127.0.0.1:3307',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'oc_root',
  'dbpassword' => '',
  'logtimezone' => 'UTC',
  'installed' => true,
  'maintenance' => false,
  'maintenance_window_start' => '1',
  'theme' => '',
  'loglevel' => 2,
  'mail_smtpmode' => 'smtp',
  'mail_smtpsecure' => 'tls',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_from_address' => '',
  'mail_domain' => '',
  'mail_smtpauth' => 1,
  'mail_smtphost' => '',
  'mail_smtpport' => '587',
  'mail_smtpname' => '',
  'mail_smtppassword' => '',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'filelocking.enabled' => true,
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'localhost',
    'port' => '6379',
    'timeout' => '0',
    'password' => '',
    'dbindex' => '0',
  ),
  'default_phone_region' => 'DE',
  'updater.release.channel' => 'stable',
  'trashbin_retention_obligation' => '30,60',
  'mysql.utf8mb4' => true,
  'preview_max_memory' => 128,
  'simpleSignUpLink.shown' => false,
  'app_install_overwrite' => 
  array (
    0 => 'calendar',
    1 => 'files_texteditor',
  ),
  'forbidden_filename_basenames' => 
  array (
    0 => 'con',
    1 => 'prn',
    2 => 'aux',
    3 => 'nul',
    4 => 'com0',
    5 => 'com1',
    6 => 'com2',
    7 => 'com3',
    8 => 'com4',
    9 => 'com5',
    10 => 'com6',
    11 => 'com7',
    12 => 'com8',
    13 => 'com9',
    14 => 'com¹',
    15 => 'com²',
    16 => 'com³',
    17 => 'lpt0',
    18 => 'lpt1',
    19 => 'lpt2',
    20 => 'lpt3',
    21 => 'lpt4',
    22 => 'lpt5',
    23 => 'lpt6',
    24 => 'lpt7',
    25 => 'lpt8',
    26 => 'lpt9',
    27 => 'lpt¹',
    28 => 'lpt²',
    29 => 'lpt³',
  ),
  'forbidden_filename_characters' => 
  array (
    0 => '<',
    1 => '>',
    2 => ':',
    3 => '"',
    4 => '|',
    5 => '?',
    6 => '*',
    7 => '\\',
    8 => '/',
  ),
  'forbidden_filename_extensions' => 
  array (
    0 => ' ',
    1 => '.',
    2 => '.filepart',
    3 => '.part',
  ),
);

Is this a bug?

Can’t anyone here help me?
Can someone perhaps recreate the problem?

I don’t know if that is relevant. When I run an “occ files:scan --all”, I get these error messages for the user who is enabled for the external storage.

Blockzitat
Starting scan for user 9 out of 12 (root)
Error during scan: Undefined array key “mtime”
Error during scan: Undefined array key “mtime”
Exception during scan: Parent folder not in filecache for docker
#0 /volume1/web/nextcloud/lib/private/Files/Cache/Wrapper/CacheWrapper.php(129):OC\Files\Cache\Cache->insert(‘docker’, Array)
#1 /volume1/web/nextcloud/lib/private/Files/Cache/Scanner.php(284): OC\Files\Cache\Wrapper\CacheWrapper->insert(‘docker’, Array)
#2 /volume1/web/nextcloud/lib/private/Files/Cache/Scanner.php(217): OC\Files\Cache\Scanner->addToCache(‘docker’, Array, -1)
#3 /volume1/web/nextcloud/lib/private/Files/Cache/Scanner.php(501): OC\Files\Cache\Scanner->scanFile(‘docker’, 3, -1, false, true, Array)
#4 /volume1/web/nextcloud/lib/private/Files/Cache/Scanner.php(425): OC\Files\Cache\Scanner->handleChildren(‘’, true, 3, -1, true, 0, false)
#5 /volume1/web/nextcloud/lib/private/Files/Cache/Scanner.php(331): OC\Files\Cache\Scanner->scanChildren(‘’, true, 3, -1, true, -1)
#6 /volume1/web/nextcloud/lib/private/Files/Utils/Scanner.php(262): OC\Files\Cache\Scanner->scan(‘’, true, 3)
#7 /volume1/web/nextcloud/apps/files/lib/Command/Scan.php(153): OC\Files\Utils\Scanner->scan(‘/root’, true, NULL)
#8 /volume1/web/nextcloud/apps/files/lib/Command/Scan.php(214): OCA\Files\Command\Scan->scanFiles(‘root’, ‘/root’, NULL, Object(Symfony\Component\Console\Output \ConsoleOutput), false, true, false)
#9 /volume1/web/nextcloud/3rdparty/symfony/console/Command/Command.php(326): OCA\Files\Command\Scan->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#10 /volume1/web/nextcloud/core/Command/Base.php(161): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object( Symfony\Component\Console\Output\ConsoleOutput))
#11 /volume1/web/nextcloud/3rdparty/symfony/console/Application.php(1078): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(S ymfony\Component\Console\Output\ConsoleOutput))
#12 /volume1/web/nextcloud/3rdparty/symfony/console/Application.php(324): Symfony\Component\Console\Application->doRunCommand(Object(OCA\Files\Command\Scan), Ob ject(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Consol e\Output\ConsoleOutput))
#13 /volume1/web/nextcloud/3rdparty/symfony/console/Application.php(175): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\Ar gvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#14 /volume1/web/nextcloud/lib/private/Console/Application.php(183): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput ), Object(Symfony\Component\Console\Output\ConsoleOutput))
#15 /volume1/web/nextcloud/console.php(87): OC\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput))
#16 /volume1/web/nextcloud/occ(11): require_once(‘/volume1/web/ne…’)
#17 {main}

Unfortunately I’ve got the same issue with my Synology NAS. Apperantly it’s currently causing a bug in Nextcloud.

My summary:
I want to integrate my NAS as external storage via SFTP.
My tests via the public DDNS are all successful, but
it fails when integrating with Nextcloud. No error message is displayed, but afterwards, no files can be shown in the Files app (“This directory is not available, please check the log files or contact the administrator.”). When I try to open the external storage, the following error message appears:
‘Error mounting external storage
An error occurred with this external storage. Would you like to check the mount point configuration on the settings page?’

Unfortunately, the error message is quite vague, and the settings seem correct from my perspective.

I’m using the same login credentials, so it doesn’t make sense to me.

Unfortunately, I have not yet found a solution.
The problem has been marked as already solved here. But apparently the problem still exists.

1 Like

The problem still exists with the latest version of Nextcloud (31.0.5).
Does no one have a solution to the problem?

The external storage is shown as correctly integrated, but then Nextcloud folder not found is written under External storage.


1 Like

The problem still exists with the latest version of Nextcloud (31.0.6).
I have now change to FTP (FTPS) and now it works.
Why does not work with SFTP to don`t know.

Should I create a Bugreport on Github or is this thread enough?

maybe workaround?..

its clear you’re not a Nextcloud snap user, but this should work regardless of which installation method is used

Nextcloud is running on my Synology DS.
But your link has put me on the right track.
I hadn’t entered anything in the “root” field because I didn’t know what to put there. There was nothing in the documentation either, so I left it blank.
But now I have entered the path to my directory and now everything works.

1 Like

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