Connecting to SQL Server from externally with proxy server

I have a server running SQL Server 2022 with a couple of instances. There is the need to grant access to an external supplier working with us on a project. The idea is: the supplier connects to our sql server on a specific database they need to access. We have created a configuration on a proxy server running nginx that allows the connection to the local sql server. However, I cannot reach the database when testing from outside. Is there any configuration I need to do on the SQL server to allow this hebavior? Thanks in advance! nginx entry ----------- server { access_log /var/log/nginx/porgreencloud1433.log upstream_time; error_log /var/log/nginx/porgreencloud1433_error.log; listen 1433; server_name porgreencloud.company.com; location / { proxy_connect_timeout 60s; proxy_socket_keepalive on; proxy_pass http://dbtcp ; } ssl_certificate /etc/letsencrypt/live/porgreencloud.company.com/fullchain.pem; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/porgreencloud.company.com/privkey.pem; # managed by Certbot include /etc/nginx/sites-available/sslsettings.conf; } SQL Server settings ------------------- Connection String ----------------- SQLUser = "ourUser" SQLPassword = "LetsConnect2DB!!" SQLServer = "porgreencloud.company.com,1433" DbConn = "Provider=SQLOLEDB.1;Persist Security Info=True;User ID=" & SQLUser & ";Password=" & SQLPassword & ";Initial Catalog=" & DBName & ";" & _ "Data Source=" & SQLServer & ";Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;" & _ "Use Encryption for Data = False;Tag with column collection when possible=False"