Flint3: cannot access port-forwarded HTTPS server using WAN IP

Routers
1

Hi,

New Flint3 user here.
I do have an HTTPS server hosted on a computer (say e.g. on IP 192.162.1.10) in the LAN network attached to my Flint3. My Flint3 takes its ip address using DHCP from my ISP. I enabled port-forwarding for port 80 and 443 to the local 192.162.1.10 ip address.

I can reach successfully my HTTPS server when I connect from:

  • mobile phone using mobile networks
  • mobile phone using the wireless network of the Flint3

However I noticed I cannot reach my HTTPS server when I connect from any device attached to the LAN interface of the Flint3. I think there is a firewall rule on the Flint3 that drops requests coming from the LAN interface going to the WAN IP.

I think this is a bug, I don’t see any security issue in allowing LAN clients to use the WAN IP to connect to a server located in the LAN itself…

Is this a known issue?

Someone already managed to solve it?

Thanks!

2

PS: I found a similar,but not identical, problem reported back in 2022 in this thread: LAN device cannot request itself through WAN IP and port forwarding

4

Hi

Please try disabling the hardware acceleration option under Admin Panel - Network - Network Acceleration.

If the issue is resolved afterward, it may indicate that QSDK hardware acceleration is interfering with NAT loopback.
You can also refer to the following post to see whether the suggested workarounds help in your setup.

5

I confirm that disabling entirely the Network Acceleration is fixing the issue.

Now I will need to understand what are the real performances of the Flint3 with acceleration disabled… I’m considering asking for replacement with a Flint2….

Thanks for the help!