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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 19.0.6):
Operating system and version (eg, Centos 7):
Apache or nginx version (eg, Apache 2.4.52):
PHP version (eg, 7.4):
The issue you are facing:
Is this the first time you’ve seen this error? (Y/N):
Steps to replicate it:
- login into nextcloud
- Access Files
The output of your Nextcloud log in Admin > Logging:
There was nothing there.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
system": {
"instanceid": "***REMOVED SENSITIVE VALUE***",
"passwordsalt": "***REMOVED SENSITIVE VALUE***",
"secret": "***REMOVED SENSITIVE VALUE***",
"trusted_domains": [
"cl.d4x.biz"
],
"datadirectory": "***REMOVED SENSITIVE VALUE***",
"memcache.local": "\\OC\\Memcache\\APCu",
"dbtype": "mysql",
"version": "19.0.6.2",
"overwrite.cli.url": "https:\/\/cl.d4x.biz",
"dbname": "***REMOVED SENSITIVE VALUE***",
"dbhost": "***REMOVED SENSITIVE VALUE***",
"dbport": "",
"dbtableprefix": "oc_",
"mysql.utf8mb4": true,
"dbuser": "***REMOVED SENSITIVE VALUE***",
"dbpassword": "***REMOVED SENSITIVE VALUE***",
"installed": true,
"loglevel": 3,
"mail_smtpmode": "smtp",
"mail_smtpsecure": "tls",
"mail_sendmailmode": "smtp",
"mail_from_address": "***REMOVED SENSITIVE VALUE***",
"mail_domain": "***REMOVED SENSITIVE VALUE***",
"mail_smtpauthtype": "LOGIN",
"mail_smtpauth": 1,
"mail_smtphost": "***REMOVED SENSITIVE VALUE***",
"mail_smtpport": "587",
"mail_smtpname": "***REMOVED SENSITIVE VALUE***",
"mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
"maintenance": false,
"trashbin_retention_obligation": "auto",
"versions_retention_obligation": "30, auto",
"updatechecker": true,
"theme": "",
"app_install_overwrite": [
"admin_notifications",
"files_readmemd",
"dashboard",
"joplin",
"files_external_gdrive",
"files_external_dropbox"
]
},
The output of your Apache/nginx/system log in /var/log/____:
Error_log
[Tue Dec 15 19:28:14.223489 2020] [:error] [pid 15987:tid 47366492501760] [client 67.60.168.59:62328] [client 67.60.168.59] ModSecurity: Access denied with code 403 (phase 2). Match of "within %{tx.allowed_methods}" against "REQUEST_METHOD" required. [file "/etc/apache2/conf.d/modsec_vendor_configs/OWASP3/rules/REQUEST-911-METHOD-ENFORCEMENT.conf"] [line "43"] [id "911100"] [msg "Method is not allowed by policy"] [data "PROPFIND"] [severity "CRITICAL"] [ver "OWASP_CRS/3.3.0"] [tag "application-multi"] [tag "language-multi"] [tag "platform-multi"] [tag "attack-generic"] [tag "paranoia-level/1"] [tag "OWASP_CRS"] [tag "capec/1000/210/272/220/274"] [tag "PCI/12.1"] [hostname "cl.d4x.biz"] [uri "/remote.php/dav/files/joe/"] [unique_id "X9lwvuqswoJmV4OkecvnoQAAAIU"]
[Tue Dec 15 19:28:14.447785 2020] [:error] [pid 15987:tid 47366492501760] [client 67.60.168.59:62328] [client 67.60.168.59] ModSecurity: Access denied with code 403 (phase 2). Match of "within %{tx.allowed_methods}" against "REQUEST_METHOD" required. [file "/etc/apache2/conf.d/modsec_vendor_configs/OWASP3/rules/REQUEST-911-METHOD-ENFORCEMENT.conf"] [line "43"] [id "911100"] [msg "Method is not allowed by policy"] [data "PROPFIND"] [severity "CRITICAL"] [ver "OWASP_CRS/3.3.0"] [tag "application-multi"] [tag "language-multi"] [tag "platform-multi"] [tag "attack-generic"] [tag "paranoia-level/1"] [tag "OWASP_CRS"] [tag "capec/1000/210/272/220/274"] [tag "PCI/12.1"] [hostname "cl.d4x.biz"] [uri "/index.php/apps/files/"] [unique_id "X9lwvuqswoJmV4OkecvnogAAAIU"]