What you have outlined is exactly how to setup port forwarding on the RV series routers.
The only 2 things I can think of in your scenario are the firewall on the ISA box, and that ports are not being allowed to pass on the firewall you have for testing.
Can you try disabling the firewall on the ISA box, plug the laptop directly into the WAN (with a static IP address on the laptop and the WAN interface on the RV series router) and try again? Also, when you do that test enable remote management and see if you can get to the WebUI of the RV router.
As a first step i am glad to know that what is done is enough and there is no step(s) missed.
On my first comment, i mentioned that i am using the Linksys router on dual mode and not DMZ mode; does that have any relation with the current problem?
Concerning firewall, firstly i disable the firewall on the Linksys router.
Second, i configured a laptop with the application Xerver to act as a webserver on port 80. i tested accessing this laptop through a lan switch and test was ok.
i tried the same test through the Linksys router where i connected this webserver laptop to a one of the lan ports of the Linksys router, and with the same config of port forwarding on the Linksys (i just modified ip address of the webserver to be the ip of the laptop) and tried to open http access through internet explorer to the ip of the Linksys router and test was negative. Test failed.
So the problem is not related to a misconfig on the isa(firewall,..)
So this indicates that there is a problem specifically in forwarding traffic from wan interface to lan interfaces. but i am not able to identify where this problem is.
What do you advise?
note: when i do enable remote mgt for the rv router, i get to the authentication screen of the rv router where i should enter username and password.
My problem is solved. it was due to a misconfiguration on the ISA level.
The port forwarding configuration is as simple as mentioned above.
On the ISA config, there is a place were i should mention what are my internal network subnets. so i was mentioning the ip address subnet of the linksys router on that list. so when replying, the ISA was fowarding the reply to inside interface and not the outside.
removing the subnet of the linksys router from that list solved the issue.
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