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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): 23.0.5.1
Operating system and version (eg, Ubuntu 20.04): CentOS8
Apache or nginx version (eg, Apache 2.4.25): Apache: httpd-2.4.37-47
PHP version (eg, 7.4): 8.0.20
The issue you are facing:
Nextcloud instance can successfully connect to self-installed,open-source version of HPB for Talk on a VPS, but calls cannot be established.
Followed How to Install Nextcloud Talk High Performance Backend with Stun/Turnserver on Ubuntu – Markus' Blog with minor tweaks to allow for newer go-lang packages etc.
Is this the first time you’ve seen this error? (Y/N):
Y
Steps to replicate it:
- install Nextcloud Instance and run it behind HAProxy
- Install HPB according to above tutorial on VPS
- Try and establish a call, any call, in NC Talk
The output of your Nextcloud log in Admin > Logging:
Nothing relevant. As i said, the connection under Settings shows success for everything.
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'passwordsalt' => 'redacted',
'secret' => 'redacted',
'trusted_domains' =>
array (
0 => '192.168.10.6',
1 => '192.168.10.4',
2 => 'nextcloud.domain.com',
),
'datadirectory' => '/var/www/html/data/',
'dbtype' => 'mysql',
'version' => '23.0.5.1',
'overwrite.cli.url' => 'http://nextcloud.domain.com',
'htaccess.RewriteBase' => '/',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'pass',
'installed' => true,
'instanceid' => 'ociu92qehwsl',
'logtimezone' => 'Africa/Johannesburg',
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => '127.0.0.1',
'port' => 6379,
),
'mail_domain' => 'my.domain.com',
'mail_from_address' => 'nextcloud',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'HOST',
'mail_smtpport' => '465',
'mail_smtpname' => 'USER',
'mail_smtppassword' => 'PASS',
'mail_smtpsecure' => 'ssl',
'maintenance' => false,
'onlyoffice' =>
array (
'verify_peer_off' => true,
),
'allow_local_remote_servers' => true,
'trusted_proxies' =>
array (
0 => '192.168.10.11',
1 => '127.0.0.1',
),
'theme' => '',
'loglevel' => 0,
'app_install_overwrite' =>
array (
0 => 'breezedark',
1 => 'drawio',
2 => 'fulltextsearch',
3 => 'fulltextsearch_elasticsearch',
4 => 'files_fulltextsearch',
5 => 'onlyoffice',
6 => 'groupfolders',
7 => 'ransomware_protection',
),
'default_phone_region' => 'ISO 3166-2:ZA',
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
);
None of the log files on Nextcloud gives me anything relevant. I had a turn server installed on my local network, and allowed firewall through, then NC Talk connects and all is going splendidly. So I know at least my NC Talk works. But the moment I try to use the external VPS as a signaling server, then it breaks.
My setup:
nextcloud on apache <-------------> HAProxy<-------->Internet<-------> HPB on VPS.
Is there anything funky I should do on HAProxy for this to work?
EDIT: Just tried now. If I only do a "TURN" server on the VPS, is works correctly and flawlessly. So it seems the issue comes in with the STUN part of the setup. The moment I add the STUN server, it all goes to hell.
Any help will be appreciated a lot!
Thanks
Hans