Problem Nginx reverse proxy

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Hello,

I have an OPNsense 18.7.10 running with Nginx 1.5 as a reverse proxy for 4 webservices that are on an internal server.

Internet -----> Nginx/OPNsense -----> IIS6.0

I do not know where I'm wrong that only a webservice is experiencing a problem. All items such as Upstream, Upstream Serve, Location, and HTTP Server have been configured in the same way with the same options. In short, I put the first one to work and the others are clones and only changed the addresses.

These webservices were running correctly on another Nginx Linux (CentOS 5.9).
All use the same certificate.

When I test the webservice through the browser the webservice page is displayed successfully and I see the packets entering my WAN interface and exiting the LAN interface towards the IIS server and I also see access logs in the successful Nginx.

But when access is done by the application, I only see the packets arrive on my WAN interface, I do not see them coming out through the LAN interface towards the IIS server and I also do not see any logs in Nginx, neither access log nor error log.

I already checked and also does not have a firewall block, I even did a test with "pfctl -F rules" and even then the behavior is the same.

Can anyone help me?  แทงบอลออนไลน์