We have an DD-WRT router. Some servers, devices in our network must be accessable from outside. They are accessable on different ports (80, 143, ...).

I configured the router and added some rules under Port Forwarding but it doesn't works always.

Like example: From 1234 to works From 1723 to works also From 40001 to doesn't work

I checked my ISP and they aren't blocking any ports (for us)... I also rebooted the router after saving the settings..

In our network we have 1 server that is a DNS / DHCP. It has it's own firewall, but I thought it was specific for that server?

If I visit my fixed WAN ip (from inside), I can access all of the ports. (1234, 1723, 40001, ...). But if I want to connect from outside, 40001 doesn't ..

What could be the reason?

  • Can you connect to locally? – mzhaase Nov 15 '16 at 15:18
  • I can.. And even with the wan ip from inside – Finduilas Nov 15 '16 at 15:46
  • Then it is some FW rule. Since it is NAT, the request will look like its coming from the DD-WRT anyway, and since you can call the WAN IP from within, it must be some rule on the router box. Maybe try and change the port just to be sure. – mzhaase Nov 15 '16 at 16:03
  • I changed 40001 to 888, but neither.. – Finduilas Nov 16 '16 at 7:45

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