FileMaker Pro is not connecting to FileMaker Server through NGINX reverse proxy but works throughout /fmi/webd/

Hi,

I'm new in FileMaker, so forgive me if that is something simple to solve.

My servers:

1. FileMaker Server
2. Ubuntu Ubuntu 22.04.2 LTS
3. FileMaker Server 20.1.1.38
4. Acme.sh Wildcard SSL
5. IP: 10.10.10.10 (as an example)
6.  
7. NGINX Reverse Proxy
8. Ubuntu Ubuntu 22.04.2 LTS
9. nginx/1.18.0
10. Acme.sh Wildcard SSL
11. IP: 10.10.10.20 (as an example)
12.  
13. Windows Pro 22H2
14. FileMaker Pro 20.1.1.35

Everything works perfectly when connected either by:

https://filemaker.domain/fmi/webd/

or

https://reverseproxy.domain/fmi/webd/

FileMaker Pro connects ok when using https://filemaker.domain but does not when using https://reverseproxy.domain

Error: Connection Failed.

The NGINX "currently" is running on the LAN. The config it is using is the one created by "/opt/FileMaker/FileMaker\ Server/Tools/NginxLB/nginxLB.sh", with the change of:

from:

1. upstream backend {
2. #using ip hash with nginx open source
3. #hash $binary_remote_addr consistent;
4. #using sticky session with nginx plus
5. sticky cookie srv_id expires=1h path=/;
6. #server 10.10.10.10:443;
7. }

to:

1. upstream backend {
2. hash $binary_remote_addr consistent;
3. server 10.10.10.10:443;
4. }

Running from the Windows Client:

telnet reverseproxy.domain 5003

Connecting To filemaker.pbti.org...Could not open connection to the host, on port 5003: Connect failed

telnet filemaker.domain 5003

Works

Trying to solve this, I have added in NGINX, this code below, without any result:

1. server {
2. listen 5003;
3. listen 16000;
4. listen 16002;
5. server_name reverseproxy.domain;
6. return 301 https://filemaker.domain$request_uri;
7. }

On the reverproxy:

1. tcp 0 0 0.0.0.0:16002 0.0.0.0:* LISTEN 1720/nginx: master
2. tcp 0 0 0.0.0.0:16000 0.0.0.0:* LISTEN 1720/nginx: master
3. tcp 0 0 0.0.0.0:443 0.0.0.0:* LISTEN 1720/nginx: master
4. tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1720/nginx: master
5. tcp 0 0 0.0.0.0:5003 0.0.0.0:* LISTEN 1720/nginx: master

 What I'm missing?