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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): 27.0.2.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.6 LTS
Apache or nginx version (eg, Apache 2.4.25): 2.4 (not sure)
PHP version (eg, 7.4): 8.2.9
The issue you are facing:
I’m not able to access the webinterface, which times out. Loading files from the Windows client or IOS app works.
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
Not sure, but it started happening when I got a new router. Although it worked for the first 24 hours
The output of your Nextcloud log in Admin > Logging:
Can’t access it since the webinterface doesn’t work. But here’s a pastebin of /data/nextcloud/nextcloud.log. I had to shorten it down because pastebin wouldn’t allow me to post the full log, but I think this is the most relevant part: nextcloud.log - Pastebin.com
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'default_phone_region' => 'CH',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'redis',
'password' => '',
'port' => 6379,
),
'instanceid' => '',
'passwordsalt' => '',
'secret' => '',
'trusted_domains' =>
array (
0 => '',
1 => '',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '27.0.2.1',
'overwrite.cli.url' => '',
'dbname' => 'nextcloud',
'dbhost' => 'db',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => '',
'installed' => true,
'loglevel' => 2,
'maintenance' => false,
'overwriteprotocol' => 'https',
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'noreply',
'mail_domain' => '',
'mail_smtpauth' => 1,
'mail_smtpauthtype' => 'LOGIN',
'mail_smtphost' => '',
'mail_smtpport' => '',
'mail_smtpname' => '',
'mail_smtppassword' => '',
);
The output of your Apache/nginx/system log in /var/log/____:
Can’t access any of those file in the docker container. It says apache2/error.log is a device file
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.
I think this is the same as I posted above: nextcloud.log - Pastebin.com
Here’s my docker-compose file
version: '3'
services:
db:
image: mariadb:10.5
command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
restart: always
volumes:
- db:/var/lib/mysql
environment:
- MYSQL_ROOT_PASSWORD=
env_file:
- db.env
redis:
image: redis:alpine
restart: always
app:
image: nextcloud:27-apache
restart: always
ports:
- 80:80
volumes:
- nextcloud:/var/www/html
- ./config:/var/www/html/config
- /data/nextcloud:/var/www/html/data
environment:
# - VIRTUAL_HOST=
# - LETSENCRYPT_HOST=
# - LETSENCRYPT_EMAIL=
- MYSQL_HOST=db
- REDIS_HOST=redis
env_file:
- db.env
depends_on:
- db
- redis
networks:
# - proxy-tier
- default
cron:
image: nextcloud:27-apache
restart: always
volumes:
- nextcloud:/var/www/html
- ./config:/var/www/html/config
- /data/nextcloud:/var/www/html/data
entrypoint: /cron.sh
depends_on:
- db
- redis
# proxy:
# build: ./proxy
# restart: always
# ports:
# - 80:80
# - 443:443
# labels:
# com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy: "true"
# volumes:
# - certs:/etc/nginx/certs:ro
# - vhost.d:/etc/nginx/vhost.d
# - html:/usr/share/nginx/html
# - /var/run/docker.sock:/tmp/docker.sock:ro
# networks:
# - proxy-tier
#
# letsencrypt-companion:
# image: nginxproxy/acme-companion
# restart: always
# volumes:
# - certs:/etc/nginx/certs
# - acme:/etc/acme.sh
# - vhost.d:/etc/nginx/vhost.d
# - html:/usr/share/nginx/html
# - /var/run/docker.sock:/var/run/docker.sock:ro
# networks:
# - proxy-tier
# depends_on:
# - proxy
volumes:
db:
nextcloud:
# certs:
# acme:
# vhost.d:
# html:
#networks:
# proxy-tier:
I have Nextcloud running behing haproxy, which also manages the SSL certificates. That’s why it’s all commented out in the docker-compose file. As said this setup worked fine until I switched routers. But after the switch the web-ui still worked for about 24 hours. I don’t know exactly when it stopped working. I already tried disabling the firewall of the router and the port-forwarding rules are setup for ports 80 and 443 (TCP/UDP also tried only TCP).
If you need more information about my setup or system feel free to ask.
Thanks for your help in advance!