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Routing problem with Web Application Firewall (virtual web server)

Hello,

I am new to this community and try my first troubleshooting on an UTM 8.

 

My setup:

Internet provider: German Telekom

Router: Bintec Elmeg / Digitalisierungsbox Premium, WAN-IP fix, LAN-IP 192.168.99.1

Portforwarding on Router: exposed host on UTM 8 (192.168.99.10), 80 on UTM 8, 443 on UTM 8

UTM8: Set up as Firewall and DNS-Forwarder, now trying to run reverse-proxy for internal web-server 
UTM8-Interfaces:
- WAN-interface (eth1) 192.168.99.10.
- LAN-interface (eth0) 192.168.100.254 (=gateway for network)
UTM8-Services:
VirtualWebServer on WAN-Interface (https&reconnect) with Let's encrypt refers to webserver

WirtualWebServer von LAN-Interface (https&reconnect) with Let's entcrypt refers to webserver

Domain:
example.domain.tld refers to fix external IP

Network:
webserver: IP 192.168.100.4 port 80

DNS: resolves example.domain.tld to external IP (So far no split DNS configured)

PROBLEM:

External http/https-requests work perfectly.

Internal requests are not going to reverse-proxy (VirtualWebServer) nor do they reach webserver. Web-frontend of the router shows up, when trying to access example.domain.tld.

Somehow the http/https-reqeust from 192.168.100.0/24 seems to get malrouted to 192.168.99.1. Can anyboby help me?

Thank you in advance!



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