Stuck in weird issue - need help pls

[Sergey A. Osokin]

Hi there,

seems like the file you request is unavailable on the remote server.

Could you run to make sure the the file is accessible:
% curl -v http://10.122.0.3/ipbl.txt

While I'm here in the configuration file you provided the backend desribed
with a hostname, not an IP address.  Is there any specific reason to do that?

-- 
Sergey Osokin

On Sat, Mar 13, 2021 at 12:10:15AM -0500, blason wrote:
> Hi Team,
> 
> I am stuck in this weird issue. I have nginx as my reverse proxy set in
> front of Apache web server Some how my proxy_pass is not working as expected
> and getting 404 not found error while retrieving page. Can someone pls
> help?
> 
> Reve Proxy IP - 10.122.0.4
> Apache 10.122.0.3
> 
> On my Rev Proxy /etc/hosts file
> 10.122.0.3      ipbl.xxxx.xxx
> 
> Here is my nginx stanza
> 
> server {
>         listen 80;
>         server_name  threat.list.xxx.xxx;
> #       return 301 https://$server_name$request_uri;
>         add_header X-Frame-Options "SAMEORIGIN";
>         modsecurity on;
>         modsecurity_rules_file /etc/nginx/modsec/main.conf;
>         error_page 404 403 /custom_404.html;
> location = /custom_404.html {
>         root /usr/share/nginx/html;
>         internal;
>         }
>         access_log /var/log/nginx/threatlist/access.log;
>         error_log /var/log/nginx/threatlist/error.log;
> location / {
>         if ($request_method !~ "GET") {
>         return 403;
>         break;
>       }
>         include /etc/nginx/threatlistacl/ipacls;
>         deny all;
>         client_max_body_size    10m;
>         client_body_buffer_size 128k;
>         proxy_send_timeout   90;
>         proxy_read_timeout   90;
>         proxy_buffer_size    128k;
>         proxy_buffers     4 256k;
>         proxy_busy_buffers_size 256k;
>         proxy_temp_file_write_size 256k;
>         proxy_connect_timeout 30s;
>         proxy_pass http://ipbl.xxxx.xxxx;
>         proxy_set_header   Host   $host;
>         proxy_set_header   X-Real-IP  $remote_addr;
>         proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
>         }
> }
> 
> Now if I access ipbl.xxx.xxx/ipbl.txt page it gets accessed successfully
> 
> Request URL: http://threat.list.xxx.xxx/ipbl.txt
> Request Method: GET
> Status Code: 404 Not Found
> Remote Address: xxx.xx.xx.xx:80
> Referrer Policy: strict-origin-when-cross-origin
> Connection: keep-alive
> Content-Type: text/html; charset=iso-8859-1
> Date: Sat, 13 Mar 2021 04:50:53 GMT
> Server: nginx
> Transfer-Encoding: chunked
> Accept:
> text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
> Accept-Encoding: gzip, deflate
> Accept-Language: en-GB,en;q=0.9
> Connection: keep-alive
> DNT: 1
> Host: threat.list.xxx.xxx
> Upgrade-Insecure-Requests: 1
> User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
> (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36
> 
> And my access.log
> 
> xx.xx.xx.xx - - [13/Mar/2021:10:31:17 +0530] "GET /ipbl.txt HTTP/1.1" 404
> 183 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36
> (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36"
> 
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,290958,290958#msg-290958
> 
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