Shouldn't this be your servers' internal IP?:
Something more like: 192.168.x.x
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Then your first task is to move the HTTP port of the router to some other number (not 80 & not 443).
If that is NOT possible... then "that is NOT possible".
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Did a quick search on that error message and found this. How old is your firmware? Would this fix it?
https://www.geekzone.co.nz/forums.asp?forumid=81&topicid=245485
Partial quote from Feb 2019:
Since I have had the new NF18ACV router I am unable to successfully change the HTTP management port on the router. By default it is on port 80. However I want to run a webserver which requires NAT on 80.
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Excellent find @MikeMcQ !
If that doesn't do the trick...
This workaround might be for a different router model but it is worth looking into:
https://www.geekrant.org/2020/04/26/setting-up-a-public-facing-webserver-behind-a-netcomm-nf18acv/
If everything fails, I'd speak with the ISP and see if they can provide an alternate router that can do what you need.
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I tried updating the firmware yesterday and that broke my internet, so I had to downgrade it to be original version.
Thank you @rg305 for finding that. I managed to change the port.
The problem is that the web server is still unreachable when using the public IP address.
Now I can add port forwarding, but even that doesn't help.
It looks like the only option will be getting another router.
Anyways, thank you for all the help 
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I'm 
If you were able to change the routers HTTP port (and disable the WAN side ports) how is it still saying?:
OR
Is it some new and different error msg now?
I think I know what's going on!
When you set the "HTTP service" to some other port, you moved that service from the router. [GOOD]
But...
When you went to create port forwarding you used "HTTP service" - which matches what the router is still using! [BAD]
You need to create a new additional service for HTTP80 and use that one for the port forwarding
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There is no error message anymore, I can add the configuration now.
But if you try browsing to http://203.211.110.83/ it does not work.
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Sorry I see that it is WAN:
But I would choose "Custom Service" instead.
Call it "AnythingUnique" and make sure it uses TCP port 80.
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Same problem
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grrrrrr....
[need more 
and must find a bigger 
]
Have you rebooted the router since the HTTP was removed from it?
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Hahaha
Rebooted the router. Still no luck.
I'll take a break.
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I give up!
I'd ask the ISP for another model.
OR for their help.
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No problem. Thank you for helping
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Just a passing thought as I read the posts... Do you see DMZ anywhere in your router? You would have to tighten the firewall on the web server of course.
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I've tried that too.
It seems to be bug with the firmware version, but if I upgrade the firmware the Internet stops working. I'll contact my ISP.
Thank you
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