Reverse Proxy to internal service with port range

Hi @francislavoie, tried doing some more troubleshooting and it seems my firewall (192.168.200.1) is intercepting the packets and dropping them (presumably)

Anything i can put in the configuration file to help get around this issue?
192.168.200.135 (Local machine)
192.168.200.203 (Server machine running service)
192.168.200.1 (Firewall) (Opnsense)

{“level”:“error”,“ts”:1617370780.5333998,“logger”:“http.log.error”,“msg”:“read tcp 192.168.200.135:57502->192.168.200.203:8206: read: connection reset by peer”,“request”:{“method”:“GET”,“uri”:"/api/server/root-certificate-public-key",“proto”:“HTTP/1.1”,“remote_addr”:“192.168.200.1:3246”,“host”:“domain.com”,“headers”:{“X-Auth”:[""],“Accept”:[“application/json”],“X-Connectionguid”:[“ec5f96-6a53-4430-ad5f-5816a72c6448”]},“tls”:{“resumed”:false,“version”:771,“ciphersuite”:49196,“proto”:"",“proto_mutual”:true,“server_name”:“domain.com”}},“duration”:0.000550915,“status”:502,“err_id”:“es2itsanc”,“err_trace”:“reverseproxy.(*Handler).ServeHTTP (reverseproxy.go:411)”}