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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, 20.0.5): 23.0.10
Operating system and version (eg, Ubuntu 20.04): Terra-Master TOS (CentOS flavour)
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4
PHP version (eg, 7.4): Php 7.3
The issue you are facing:
Receiving WebDav fatal errors in log.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
- Start server.
- Connect clients (whether desktop or iOS)
- Clients begin synchronising.
The output of your Nextcloud log in Admin > Logging:
Sabre\DAV\Exception: Unknown error while seeking content
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/apps/dav/lib/BulkUpload/MultipartRequestParser.php - line 129:
OCA\DAV\BulkUpload\MultipartRequestParser->isAt("--boundary_ ... n")
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/apps/dav/lib/BulkUpload/BulkUploadPlugin.php - line 69:
OCA\DAV\BulkUpload\MultipartRequestParser->isAtLastBoundary()
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php - line 89:
OCA\DAV\BulkUpload\BulkUploadPlugin->httpPost(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 472:
Sabre\DAV\Server->emit("method:POST", [ Sabre\HTTP ... }])
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 253:
Sabre\DAV\Server->invokeMethod(Sabre\HTTP\Request {}, Sabre\HTTP\Response {})
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 321:
Sabre\DAV\Server->start()
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/apps/dav/lib/Server.php - line 339:
Sabre\DAV\Server->exec()
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/apps/dav/appinfo/v2/remote.php - line 35:
OCA\DAV\Server->exec()
/mnt/md0/application/Nextcloud_okm/bin/nextcloud/remote.php - line 166:
require_once("/mnt/md0/ap ... p")
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'ocy3ml194qsh',
'passwordsalt' => 'xx',
'secret' => 'xxx',
'trusted_domains' =>
array (
0 => '192.168.x.xxx:xxxxx',
1 => '192.168.x.xxx:xxxxx',
),
'datadirectory' => '/mnt/md2/nextcloud/data',
'dbtype' => 'mysql',
'version' => '23.0.0.10',
'overwrite.cli.url' => 'https://192.168.x.xxx:xxxxx',
'dbname' => 'nextcloud',
'dbhost' => '127.0.0.1:3307',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => ' ',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '127.0.0.1',
'port' => ,
),
'default_phone_region' => ' ',
0 =>
array (
'trusted_proxies' => ' ',
'overwritehost' => ' ',
'overwriteprotocol' => 'https',
'overwritewebroot' => 'http:// ',
),
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => ' ',
'mail_domain' => ' ',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => ' ',
'mail_smtpport' => ' ',
'mail_smtpname' => ' ',
'mail_smtppassword' => ' ',
);
The output of your Apache/nginx/system log in /var/log/____:
2021/12/03 17:43:45 [error] 2775#2775: *34022 open() "/usr/www/favicon.ico" failed (2: No such file or directory), client: 192.168.7.124, server: znasnginx, request: "GET /favicon.ico HTTP/1.1", host: "192.168.x.xxx:5443", referrer: "https://192.168.x.xxx:xxxx/"
2021/12/03 17:44:11 [error] 2775#2775: *34066 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.7.124, server: znasnginx, request: "GET /tos/index.php HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fpm.sock:", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.7.xxx:xxxx/tos/index.php?user/login"
2021/12/03 20:05:13 [error] 2775#2775: *38832 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.x.xxx, server: znasnginx, request: "GET /tos/index.php HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fpm.sock:", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/tos/index.php?user/login"
2021/12/04 05:39:33 [error] 2778#2778: *45530 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.x.xxx, server: znasnginx, request: "GET /tos/index.php?user/common_js&type=desktop&id=eKTEYMCF HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fpm.sock:", host: "192.168.7.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/tos/index.php"
2021/12/04 07:19:47 [error] 2778#2778: *48279 open() "/usr/www/favicon.ico" failed (2: No such file or directory), client: 192.168.x.xx, server: znasnginx, request: "GET /favicon.ico HTTP/1.1", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/"
2021/12/04 07:19:58 [error] 2775#2775: *48301 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 192.168.x.xx, server: znasnginx, request: "GET /tos/index.php HTTP/1.1", upstream: "fastcgi://unix:/tmp/php-fpm.sock:", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/tos/index.php?user/login"
2021/12/04 21:22:48 [warn] 2778#2778: *48917 a client request body is buffered to a temporary file /var/cache/nginx/client-body/0000000808, client: 192.168.x.xxx, server: znasnginx, request: "POST /modules/Nextcloud_okm/www/ax/handler.php HTTP/1.1", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/modules/Nextcloud_okm/www/index.php?page=2"
2021/12/04 21:30:41 [warn] 2775#2775: *49308 a client request body is buffered to a temporary file /var/cache/nginx/client-body/0000000809, client: 192.168.x.xxx, server: znasnginx, request: "POST /modules/Nextcloud_okm/www/ax/handler.php HTTP/1.1", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/modules/Nextcloud_okm/www/index.php?page=2"
2021/12/04 21:31:06 [warn] 2775#2775: *49225 a client request body is buffered to a temporary file /var/cache/nginx/client-body/0000000810, client: 192.168.x.xxx, server: znasnginx, request: "POST /modules/Nextcloud_okm/www/ax/handler.php HTTP/1.1", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/modules/Nextcloud_okm/www/index.php?page=2"
2021/12/04 21:31:27 [warn] 2775#2775: *49425 a client request body is buffered to a temporary file /var/cache/nginx/client-body/0000000811, client: 192.168.x.xxx, server: znasnginx, request: "POST /modules/Nextcloud_okm/www/ax/handler.php HTTP/1.1", host: "192.168.x.xxx:xxxx", referrer: "https://192.168.x.xxx:xxxx/modules/Nextcloud_okm/www/index.php?page=2"