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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, 12.0.2): 16.01RC1
Operating system and version (eg, Ubuntu 17.04): KDE Neon (newest)
Apache or nginx version (eg, Apache 2.4.25): Nextcloud from docker 16.01RC1 with Apache
PHP version (eg, 7.1):
The issue you are facing:
Nextcloud Talk closes conversation after few failed attempts of signalling. There are 404 errors in DevTools. Server has configured custom TURN/STUN and video conversations between networks works great. Signalling server is missing in settings and I have no idea how to configure it.
The issue is a problem for publicly linked chats, where not technical users are uncommon with Nextcloud
Is this the first time you’ve seen this error? (Y/N):N
Steps to replicate it:
Open
- Nextcloud Talk
- Create public conversation, click link in Incognito Mode with Devtools opened
- Watch console for 404 errors.
- After message “stop pulling messages after repeated failures” chat closes. If it’s opened by public link, it redirects user to login screen.
The output of your Nextcloud log in Admin > Logging:
No backend logs related to this.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'trusted_proxies' =>
array (
0 => '172.29.12.2',
),
'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',
'port' => 6379,
),
'passwordsalt' => 'secret',
'secret' => 'secret',
'trusted_domains' =>
array (
0 => 'tcdintranet.icu',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'pgsql',
'version' => '16.0.1.0',
'dbname' => 'cloud',
'dbhost' => 'db',
'dbport' => '',
'dbtableprefix' => '',
'dbuser' => 'secret',
'dbpassword' => 'secret',
'installed' => true,
'instanceid' => 'ocz5y91arj74',
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'ssl',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'notneeded',
'mail_domain' => 'notneeded',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'notneeded',
'mail_smtpport' => '465',
'mail_smtpname' => 'notneeded',
'mail_smtppassword' => 'notneeded',
'maintenance' => false,
'updater.release.channel' => 'beta',
'overwritehost' => 'tcdintranet.icu',
'overwriteprotocol' => 'https',
'overwrite.cli.url' => 'https://tcdintranet.icu',
'theme' => '',
'loglevel' => 2,
'app_install_overwrite' =>
array (
0 => 'admin_notifications',
),
);
The output of your Apache/nginx/system log in /var/log/____:
tcdintranet.icu 192.168.1.1 - - [20/May/2019:08:10:47 +0000] "GET /ocs/v2.php/apps/spreed/api/v1/signaling/5ix5mvyf HTTP/2.0" 404 111 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.157 Safari/537.36"