[Bug]: SMB external storage fails to connect with Active Directory LDAP users after initial sync

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

After setting up an SMB external storage for users authenticated via LDAP (Active Directory integration), I tested all three authentication methods provided by Nextcloud:

• Log-in credentials, save in session
• Log-in credentials, save in database
• Login and password

In all three cases, the mount works correctly for some time. However, after several hours (or after reconnecting the desktop client), the SMB storage becomes unavailable and file access fails. This affects only users authenticated via LDAP.

The desktop client throws errors like:

Error transferring https://file.atim.tech/remote.php/dav/files/1B5B546B-B94A-4AFE-8121-B9C454BC72C4/ATIM network drive/... - server replied: Not Found

Meanwhile, the server is reachable and available. For example:

nc -vz server1.atim.tech 636
# Connection to server1.atim.tech (10.200.200.21) 636 port [tcp/ldaps] succeeded!

Log entries show:

Sabre\DAV\Exception\NotFound: File with name //ATIM network drive could not be located
OC\Files\StorageNotAvailableException: Storage with mount id 11 is not available

I attached a recent extract from nextcloud.log showing this behavior. LDAP integration works fine for login and initial mount, but storage access fails after some time.

Actual behavior

After a period of time, the SMB mount becomes unavailable. Desktop clients show “Not Found” errors, and server logs indicate missing storage and files.

Notes

• Tested on Nextcloud 31.0.4 (manual install)
• Ubuntu Server 24.04
• SMB host: Windows Server 2022
• LDAP port: tested with 389 and 636
• Web interface also fails to open affected SMB folders
• Cyrillic folder names involved (e.g. “ATIM Network Drive") or Disk ATIM

Attachment

See attached log file with Sabre\DAV\Exception\NotFound and StorageNotAvailableException messages.

Steps to reproduce

1. Configure LDAP integration with Active Directory.
2. Add an external SMB share using any of the 3 authentication options listed above.
3. Log in as a domain user (LDAP-authenticated).
4. Wait a few hours
5. Attempt to open a file from the SMB share.

Expected behavior

The external SMB storage remains mounted and accessible as long as credentials are valid.

Nextcloud Server version

31

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Apache (supported)

Database engine version

MySQL

Is this bug present after an update or on a fresh install?

Fresh Nextcloud Server install

Are you using the Nextcloud Server Encryption module?

Encryption is Disabled

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

root@file:~# sudo -u www-data php /var/www/nextcloud/occ config:list system
{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "file.atim.tech"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "31.0.4.1",
        "overwrite.cli.url": "https:\/\/file.atim.tech",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "ldapProviderFactory": "OCA\\User_LDAP\\LDAPProviderFactory",
        "enable_external_storage": true,
        "smb.logging.enable": true,
        "smbclient.disable_cache": true,
        "maintenance_window_start": 2,
        "maintenance": false,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "filelocking.enabled": true,
        "memcache.locking": "\\OC\\Memcache\\APCu",
        "default_phone_region": "RU",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_sendmailmode": "smtp",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpauth": true,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpsecure": "ssl",
        "loglevel": 0,
        "backgroundjobs_mode": "cron",
        "session_lifetime": 86400,
        "session_keepalive": true,
        "enable_legacy_smb_protocols": true
    }
}

List of activated Apps

root@file:~# sudo -u www-data php /var/www/nextcloud/occ app:list
Enabled:
  - activity: 4.0.0
  - app_api: 5.0.2
  - bruteforcesettings: 4.0.0
  - circles: 31.0.0
  - cloud_federation_api: 1.14.0
  - comments: 1.21.0
  - contactsinteraction: 1.12.0
  - dashboard: 7.11.0
  - dav: 1.33.0
  - federatedfilesharing: 1.21.0
  - federation: 1.21.0
  - files: 2.3.1
  - files_downloadlimit: 4.0.0
  - files_external: 1.23.0
  - files_pdfviewer: 4.0.0
  - files_reminders: 1.4.0
  - files_sharing: 1.23.1
  - files_trashbin: 1.21.0
  - files_versions: 1.24.0
  - firstrunwizard: 4.0.0
  - logreader: 4.0.0
  - lookup_server_connector: 1.19.0
  - nextcloud_announcements: 3.0.0
  - notifications: 4.0.0
  - oauth2: 1.19.1
  - password_policy: 3.0.0
  - photos: 4.0.0-dev.1
  - privacy: 3.0.0
  - profile: 1.0.0
  - provisioning_api: 1.21.0
  - recommendations: 4.0.0
  - related_resources: 2.0.0
  - serverinfo: 3.0.0
  - settings: 1.14.0
  - sharebymail: 1.21.0
  - support: 3.0.0
  - survey_client: 3.0.0
  - systemtags: 1.21.1
  - text: 5.0.0
  - theming: 2.6.1
  - twofactor_backupcodes: 1.20.0
  - updatenotification: 1.21.0
  - user_ldap: 1.22.0
  - user_status: 1.11.0
  - viewer: 4.0.0
  - weather_status: 1.11.0
  - webhook_listeners: 1.2.0
  - workflowengine: 2.13.0
Disabled:
  - admin_audit: 1.21.0
  - encryption: 2.19.0
  - suspicious_login: 9.0.1
  - twofactor_nextcloud_notification: 5.0.0
  - twofactor_totp: 13.0.0-dev.0

Nextcloud Signing status

No errors have been found.

Nextcloud Logs

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{"reqId":"9LqKXo4h3ntEfoyPrTOB","level":0,"time":"2025-05-30T12:08:35+00:00","remoteAddr":"147.45.152.197","user":"1B5B546B-B94A-4AFE-8121-B9C454BC72C4","app":"app_api","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"ExApp \"firstrunwizard\" not found.","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 YaBrowser/25.4.0.0 Safari/537.36","version":"31.0.4.1","data":{"app":"app_api"}}
{"reqId":"9LqKXo4h3ntEfoyPrTOB","level":0,"time":"2025-05-30T12:08:35+00:00","remoteAddr":"147.45.152.197","user":"1B5B546B-B94A-4AFE-8121-B9C454BC72C4","app":"app_api","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"ExApp \"firstrunwizard\" not found.","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 YaBrowser/25.4.0.0 Safari/537.36","version":"31.0.4.1","data":{"app":"app_api"}}
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{"reqId":"9LqKXo4h3ntEfoyPrTOB","level":0,"time":"2025-05-30T12:08:35+00:00","remoteAddr":"147.45.152.197","user":"1B5B546B-B94A-4AFE-8121-B9C454BC72C4","app":"app_api","method":"GET","url":"/ocs/v2.php/apps/notifications/api/v2/notifications","message":"ExApp \"updatenotification\" not found.","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 YaBrowser/25.4.0.0 Safari/537.36","version":"31.0.4.1","data":{"app":"app_api"}}
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Additional info

nextcloud (14).log
nextcloud (13).log

Start by reproducing the delayed failure with the LDAP and SMB configuration described, then trace the reported exception through apps/user_ldap/lib/Helper.php, apps/user_ldap/lib/AppInfo/Application.php, and lib/private/AppConfig.php. Compare the LDAP-authenticated path with the initial successful mount and inspect the attached log for the transition to StorageNotAvailableException. Done means the SMB mount remains accessible after the waiting period and regression coverage demonstrates that behavior.