On Wed, 13 Feb 2019 11:30 pm Igor Cicimov <icici...@gmail.com wrote:
> 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
>
>
Actually for routing to the localhost interface you need this one:
$ sudo sysctl -w net.ipv4.conf.eth0.route_localnet=1
assuming eth0 is your interface receiving the traffic.
>
