[Bug]: Webdav broken after update Nextcloud 30.0.6 to 31 - plus Workaround - Solved by removing "emlviewer"

[tobefrank1]

⚠️ 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 updating Nextcloud from 30.0.6 to 31.0. Webdav stopped working.

There is a new setup errors warning:

Your web server is not yet properly set up to allow file synchronization, because the WebDAV interface seems to be broken. To allow this check to run, you have to make sure that your Web server can connect to itself. Therefore, it must be able to resolve and connect to at least one of its trusted_domains or the overwrite.cli.url. This failure may be the result of a server-side DNS mismatch or outbound firewall rule.
Your web server is not properly set up to resolve .well-known URLs, failed on: /.well-known/caldav For more details, see the documentation ↗.

The point is that Webdav and caldav were working in 30.0.6 without a problem, now they are broken.
I have no clue what to do, as Google tell that in older problems only "Wait for the new update" was the solution.

Workaround:
The Nextcloud desktop app is working. Trying to mount Webdav with Mountain Duck (proprietary for Win) fails, but using Mountain Duck in Nextcloud mode works.

Steps to reproduce

1. Update to Nextcloud 31

Expected behavior

Webdav - Caldav - working.
Update with no errors.

Nextcloud Server version

31

Operating system

Debian/Ubuntu

PHP engine version

PHP 8.3

Web server

Nginx

Database engine version

MariaDB

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

Upgraded to a MAJOR version (ex. 31 to 32)

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

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

Configuration report

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "https:\/\/cloud.server.com",
            "localhost",
            "127.0.0.1",
            "cloud.server.com",
            "192.168.188.160",
            "192.168.188.0"
        ],
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "31.0.0.18",
        "overwrite.cli.url": "https:\/\/cloud.server.com",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "activity_expire_days": 14,
        "allow_local_remote_servers": true,
        "auth.bruteforce.protection.enabled": true,
        "forbidden_filenames": [
            ".htaccess",
            "Thumbs.db",
            "thumbs.db"
        ],
        "cron_log": true,
        "default_phone_region": "NL",
        "enable_previews": true,
        "preview_max_filesize_image": "5",
        "preview_libreoffice_path": "\/usr\/bin\/libreoffice",
        "enabledPreviewProviders": [
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\Movie",
            "OC\\Preview\\PDF",
            "OC\\Preview\\MP3",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\HEIC",
            "OC\\Preview\\Movie",
            "OC\\Preview\\MKV",
            "OC\\Preview\\MP4",
            "OC\\Preview\\AVI"
        ],
        "filesystem_check_changes": 0,
        "filelocking.enabled": "true",
        "htaccess.RewriteBase": "\/",
        "integrity.check.disabled": false,
        "knowledgebaseenabled": false,
        "log_rotate_size": "104857600",
        "logfile": "\/var\/log\/nextcloud\/nextcloud.log",
        "loglevel": 2,
        "logtimezone": "Europe\/Berlin",
        "maintenance_window_start": 1,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "overwriteprotocol": "https",
        "preview_max_x": 1024,
        "preview_max_y": 768,
        "preview_max_scale_factor": 1,
        "profile.enabled": false,
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "timeout": 0.5,
            "dbindex": 1
        },
        "quota_include_external_storage": false,
        "share_folder": "\/Freigaben",
        "skeletondirectory": "",
        "trashbin_retention_obligation": "auto, 7",
        "maintenance": false,
        "mail_smtpmode": "smtp",
        "mail_smtpsecure": "ssl",
        "mail_sendmailmode": "smtp",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "ail_domain": "sherart.com",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpauth": 1,
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "465",
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "theme": "",
        "app_install_overwrite": [],
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "data-fingerprint": "1a23d33daba1b5f12b4e13440a1c17"
    }

List of activated Apps

Enabled:
  - activity: 4.0.0
  - admin_audit: 1.21.0
  - app_api: 5.0.2
  - assistant: 2.4.0
  - bookmarks: 15.1.0
  - calendar: 5.1.2
  - circles: 31.0.0-dev.0
  - cloud_federation_api: 1.14.0
  - collectives: 2.16.1
  - comments: 1.21.0
  - contacts: 7.0.1
  - contactsinteraction: 1.12.0
  - dashboard: 7.11.0
  - dav: 1.33.0
  - emlviewer: 1.0.11
  - end_to_end_encryption: 1.17.0
  - event_update_notification: 2.6.1
  - federatedfilesharing: 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
  - logreader: 4.0.0
  - lookup_server_connector: 1.19.0
  - mail: 4.2.2
  - nextcloud_announcements: 3.0.0
  - notes: 4.11.0
  - notifications: 4.0.0
  - oauth2: 1.19.1
  - password_policy: 3.0.0
  - photos: 4.0.0-dev.1
  - previewgenerator: 5.8.0
  - privacy: 3.0.0
  - profile: 1.0.0
  - provisioning_api: 1.21.0
  - recommendations: 4.0.0
  - related_resources: 2.0.0
  - richdocuments: 8.6.2
  - richdocumentscode: 24.4.1204
  - serverinfo: 3.0.0
  - settings: 1.14.0
  - sharebymail: 1.21.0
  - systemtags: 1.21.1
  - tasks: 0.16.1
  - text: 5.0.0
  - theming: 2.6.1
  - twofactor_backupcodes: 1.20.0
  - twofactor_nextcloud_notification: 5.0.0
  - twofactor_totp: 13.0.0-dev.0
  - updatenotification: 1.21.0
  - user_status: 1.11.0
  - viewer: 4.0.0
  - weather_status: 1.11.0
  - webapppassword: 25.2.0
  - workflowengine: 2.13.0
Disabled:
  - bruteforcesettings: 4.0.0 (installed 4.0.0)
  - context_chat: 4.1.0 (installed 4.1.0)
  - deck: 1.15.0 (installed 1.15.0)
  - encryption: 2.19.0
  - external: 6.0.1 (installed 6.0.1)
  - extract: 1.3.6 (installed 1.3.6)
  - federation: 1.21.0 (installed 1.14.0)
  - files_accesscontrol: 2.0.0 (installed 2.0.0)
  - files_fulltextsearch: 30.0.0 (installed 30.0.0)
  - files_inotify: 0.2.2 (installed 0.1.15)
  - fileslibreofficeedit: 2.0.1 (installed 2.0.1)
  - firstrunwizard: 4.0.0 (installed 2.13.0)
  - fulltextsearch: 31.0.0 (installed 31.0.0)
  - fulltextsearch_elasticsearch: 31.0.0 (installed 31.0.0)
  - geoblocker: 0.5.15 (installed 0.5.15)
  - groupfolders: 19.0.3 (installed 19.0.3)
  - openotp_auth: 1.30.5 (installed 1.30.5)
  - ownershiptransfer: 1.1.0 (installed 1.1.0)
  - side_menu: 4.0.1 (installed 4.0.1)
  - spreed: 21.0.0 (installed 21.0.0)
  - support: 3.0.0 (installed 1.7.0)
  - survey_client: 3.0.0 (installed 1.12.0)
  - suspicious_login: 9.0.1
  - translate: 2.2.0 (installed 2.2.0)
  - user_ldap: 1.22.0
  - user_migration: 7.0.1 (installed 7.0.1)
  - webhook_listeners: 1.2.0 (installed 1.1.0-dev)
  - whiteboard: 1.0.5 (installed 1.0.5)
  - workflow_script: 2.0.0 (installed 2.0.0)

Nextcloud Signing status

Nextcloud Logs

Additional info

No response

[susnux]

Do you have any issues except the setup check?

The setup check means that the server - as stated - cannot connect to the webdav endpoint.
Please make sure that you can connect from your server machine to itself, if you have shell access you can try:

curl -I URL/remote.php/webdav -X PROPFIND 2>/dev/null | grep HTTP

Where URL is the value of your cli.override.url setting.

The expected output is one of this:

• HTTP/2 401
• HTTP/1.1 401
• HTTP/2 207
• HTTP/1.1 207

[kjllmeplz]

i had same problem after update to 31.
Tried the command above and the result is : HTTP/2 500

[susnux]

HTTP/2 500

In this case please look for an entry in your nextcloud.log - if there is nothing related please also check your webserver error logs.

[kjllmeplz]

HTTP/2 500

In this case please look for an entry in your nextcloud.log - if there is nothing related please also check your webserver error logs.

Thank you for your suggest. When i traced log in nextcloud.log, based on log file, I've found that one of my apps is not update.
After updating this app, webdav is back to normal.

[susnux]

@tobefrank1 can you please check if this also helps for you?

[duanvt]

Having the same problem, my problem is that the "emlviewer" app is not compatible.
try removing it from the app list

[tobefrank1]

Yes, I found that out yesterday too.
Since I have 2 Nextclouds running, the one without “emlviewer” had no update problems :).

So the cause and solution would be to

** remove emlviewer **

as it is not compatible and also causes a serious problem with Nextcloud Mail.

It looks like, the system is back to normal now.

Thank you for your help.

[TheMBeat]

I have the same error and no emlviewer installed. i get 500 as response any idea what i can do?

[susnux]

@TheMBeat check your nextcloud log for anything related

[tobefrank1]

@susnux as you suggested, I ran after removing elmviewer.

curl -I URL/remote.php/webdav -X PROPFIND 2>/dev/null | grep HTTP

Where URL is the value of your cli.override.url setting.

the output is HTTP/2 401,
as you said, that should be normal.

[susnux]

@tobefrank1 yes that can be normal meaning then there should be not setup check warning about webdav anymore ✅