On Wed, 13 Feb 2019 9:44 pm Patrick Kirk <patr...@kirks.net wrote:
> Hi all,
>
> I have a simple asp.net core site that runs with Postgres which works
> fine if I login as root and set it to run on port 80. SSL is done by
> cloudflare. I would prefer to use nginx or at least have an iptable
> rule to redirect the port 80 traffic. Both have the same failure so for
> now I am trying with iptables.
>
> I don't believe this is an issue with asp.net but the line I use to set
> ports is:
>
> public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
> WebHost.CreateDefaultBuilder(args).UseUrls("http://localhost:5000";,
> "http://*:80";)
> .UseStartup<Startup>();
>
> To run the program on port 80, I have to run as root which I want to get
> away from. So I remove the port 80 from Program.cs and then run the
> program. Output of nmap is:
>
> Starting Nmap 7.40 ( https://nmap.org ) at 2019-02-13 10:35 UTC
> Nmap scan report for localhost (127.0.0.1)
> Host is up (0.0000080s latency).
> Not shown: 997 closed ports
> PORT STATE SERVICE
> 22/tcp open ssh
> 5000/tcp open upnp
> 5432/tcp open postgresql
>
> If I try the iptables route the command I use is:
>
> iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port
> 5000
>
> This works fine for Lynx http://localhost but for my url I get
>
> "Alert!: HTTP/1.1 521 Origin Down"
>
> If I try to use nginx, which I believe is configured correctly, I get
> the exact same issue.
>
> Has anyone any idea what's wrong with my setup?
>
> Patrick
Run:
$ sudo sysctl -w net.ipv4.ip_forward=1
