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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
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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, 20.0.5): 24.0.4
Operating system and version (eg, Ubuntu 20.04): Debian 11
Apache or nginx version (eg, Apache 2.4.25): nginx 1.23.1 on server 2, nginx 1.22.0 on Raspberry Pi
PHP version (eg, 7.4): 8.1.9
The issue you are facing:
After I installed the Nextcloud on a new server based on Debian 11, behind a proxy-pass (A Raspberry Pi 4 as proxy-pass and the purpose for proxy-pass is to redirect some services from Raspberry Pi to the new server, as a lack of time to move all of the services to the new server), i can’t upload file larger than about 10 mb/file. I get only Operation is blocked by access control, notification and this issue is very annoying.
Both the server and Proxy-Pass are based on NGiNX.
If I’m using an ipv6 connection that is directly connected to the server2 on which is nextcloud installed, I don’t have this problem.
Is this the first time you’ve seen this error? (Y/N): N
Steps to replicate it:
- Configure proxy-pass on Raspberry Pi
- Configure NGINX on the second server.
- Configure Nextcloud on the second server.
The output of your Nextcloud log in Admin > Logging:
https://pastebin.com/5ZgD4vLX
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'instanceid',
'passwordsalt' => 'passwordsalt',
'secret' => 'secret',
'trusted_domains' =>
array (
0 => 'subdomain,
1 => 'ipv6.subdomain',
2 => '10.10.10.9',
),
'datadirectory' => '/data/subdomainurl/data',
'dbtype' => 'mysql',
'version' => '24.0.4.1',
'overwrite.cli.url' => 'https://subdomain',
'dbname' => 'cdn',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'dbuser',
'dbpassword' => 'dbpass',
'installed' => true,
'updater.release.channel' => 'stable',
'maintenance' => false,
'theme' => '',
'loglevel' => 1,
'default_phone_region' => 'RO',
'mail_from_address' => 'no-reply',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_domain' => 'domain',
'mail_smtpauthtype' => 'PLAIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp,
'mail_smtpname' =>'mail',
'mail_smtppassword' => 'pass',
'mail_smtpport' => 'port',
'mail_smtpsecure' => 'ssl',
'defaultapp' => '“files”',
'memcache.local' => '\\OC\\Memcache\\APCu',
'trusted_proxies' =>
array (
0 => '10.10.10.8',
),
'app_install_overwrite' =>
array (
0 => 'registration',
1 => 'sensorlogger',
),
'updater.secret' => 'secret',
);
The output of your Apache/nginx/system log in /var/log/____:
Server 2:
2022/09/05 01:54:11 [notice] 366204#366204: *3 "^" matches "/csrftoken", client: 10.10.10.8, server: subdomainserver, request: "GET /csrftoken HTTP/1.1", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
2022/09/05 01:54:11 [notice] 366204#366204: *3 rewritten data: "/index.php/csrftoken", args: "", client: 10.10.10.8, server: subdomainserver, request: "GET /csrftoken HTTP/1.1", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
2022/09/05 01:54:35 [notice] 366205#366205: *13 "^" matches "/apps/files/ajax/getstoragestats", client: 10.10.10.8, server: subdomainserver, request: "GET /apps/files/ajax/getstoragestats?dir=%2FPI%20RESTANTA%2FPI%2B%2B HTTP/1.1", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
2022/09/05 01:54:35 [notice] 366205#366205: *13 rewritten data: "/index.php/apps/files/ajax/getstoragestats", args: "dir=%2FPI%20RESTANTA%2FPI%2B%2B", client: 10.10.10.8, server: subdomainserver, request: "GET /apps/files/ajax/getstoragestats?dir=%2FPI%20RESTANTA%2FPI%2B%2B HTTP/1.1", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
Proxy-Pass access log:
10.10.10.1 - - [05/Sep/2022:02:03:09 +0300] "GET / HTTP/2.0" 302 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:09 +0300] "GET /apps/files/ HTTP/2.0" 200 11054 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:10 +0300] "GET /robots.txt HTTP/2.0" 302 0 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:10 +0300] "GET /apps/files/ HTTP/2.0" 200 11057 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:10 +0300] "GET /ocs/v2.php/search/providers?from=%2Fapps%2Ffiles%2F HTTP/2.0" 200 231 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "GET /ocs/v2.php/apps/notifications/api/v2/notifications HTTP/2.0" 200 81 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "PUT /apps/user_status/heartbeat HTTP/2.0" 200 114 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "GET /ocs/v1.php/apps/files_external/api/v1/mounts?format=json HTTP/2.0" 200 103 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "GET /apps/recommendations/api/recommendations HTTP/2.0" 499 0 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "GET /ocs/v2.php/core/whatsnew?format=json HTTP/2.0" 499 0 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "GET /ocs/v2.php/apps/text/workspace?path=%2F HTTP/2.0" 499 0 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:11 +0300] "PROPFIND /remote.php/dav/files/ugd/ HTTP/2.0" 499 0 "https://subdomainserver/apps/files/" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:18 +0300] "MKCOL /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467 HTTP/2.0" 201 0 "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208" "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Mobile Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:20 +0300] "PUT /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467/0 HTTP/2.0" 201 0 "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208" "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Mobile Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:20 +0300] "PUT /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467/10485760 HTTP/2.0" 201 0 "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208" "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Mobile Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:20 +0300] "MOVE /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467/.file HTTP/2.0" 403 548 "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208" "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Mobile Safari/537.36" - - - - - - - -
10.10.10.1 - - [05/Sep/2022:02:03:20 +0300] "GET /apps/files/ajax/getstoragestats?dir=%2FPI%20RESTANTA%2FPI%2B%2B HTTP/2.0" 200 194 "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208" "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Mobile Safari/537.36" - - - - - - - -
Proxy-Pass error log:
2022/09/05 02:03:18 [warn] 2180731#2180731: *1 a client request body is buffered to a temporary file /var/cache/nginx/client_temp/0000000001, client: 10.10.10.1, server: subdomainserver, request: "PUT /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467/0 HTTP/2.0", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
2022/09/05 02:03:20 [warn] 2180731#2180731: *1 a client request body is buffered to a temporary file /var/cache/nginx/client_temp/0000000002, client: 10.10.10.1, server: subdomainserver, request: "PUT /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467/10485760 HTTP/2.0", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
2022/09/05 02:03:20 [error] 2180731#2180731: *1 access forbidden by rule, client: 10.10.10.1, server: subdomainserver, request: "MOVE /remote.php/dav/uploads/ugd/web-file-upload-95e26e2a7bbbc7535a57fe81f5dd3763-1662332598467/.file HTTP/2.0", host: "subdomainserver", referrer: "https://subdomainserver/apps/files/?dir=/PI%20RESTANTA/PI%2B%2B&fileid=167208"
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.
https://pastebin.com/N3Re8QZb