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[GH-ISSUE #1133] Internal DNS resolution not working #932

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opened 2026-02-26 06:35:02 +03:00 by kerem · 2 comments

kerem commented

2026-02-26 06:35:02 +03:00

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Originally created by @Knocks83 on GitHub (May 28, 2021).
Original GitHub issue: https://github.com/NginxProxyManager/nginx-proxy-manager/issues/1133

Checklist

Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
- Yes
Are you sure you're not using someone else's docker image?
- Yes
Have you searched for similar issues (both open and closed)?
- Yes

Describe the bug

The internal DNS resolution does not work, so it cannot create/renew certificates

Nginx Proxy Manager Version

2.8.1 (even if now it doesn't even start anymore)

To Reproduce
Steps to reproduce the behavior:

docker exec -it npm bash
ping google.com

Expected behavior

It should resolve the hostname

Screenshots

The result of ping google.com:

Operating System

Ubuntu 20.04

Additional context

I have a pihole on the same machine as npm. The host naturally can ping Google without any problem.

The error it throws that doesn't allow npm to start:

[5/28/2021] [4:00:41 PM] [Global   ] › ✖  error     Command failed: pip3 install certbot-dns-cloudflare==1.8.0 cloudflare
WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f5d160>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f7df10>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f7df70>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f65f10>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f5d370>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/
ERROR: Could not find a version that satisfies the requirement certbot-dns-cloudflare==1.8.0 (from versions: none)
ERROR: No matching distribution found for certbot-dns-cloudflare==1.8.0

And finally this is my docker-compose.yml file:

version: "3"
services:
  app:
    image: 'jc21/nginx-proxy-manager:latest'
    container_name: npm
    restart: always
    ports:
      # Public HTTP Port:
      - '80:80'
      # Public HTTPS Port:
      - '443:443'
      # Admin Web Port:
      - '81:81'
    volumes:
      - ./config.json:/app/config/production.json
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt

What did I try?
I tried to set the dns value in the docker-compose file to my DNS server, there was no difference.

Originally created by @Knocks83 on GitHub (May 28, 2021). Original GitHub issue: https://github.com/NginxProxyManager/nginx-proxy-manager/issues/1133  **Checklist** - Have you pulled and found the error with `jc21/nginx-proxy-manager:latest` docker image? - Yes - Are you sure you're not using someone else's docker image? - Yes - Have you searched for similar issues (both open and closed)? - Yes **Describe the bug**  The internal DNS resolution does not work, so it cannot create/renew certificates **Nginx Proxy Manager Version**  2.8.1 (even if now it doesn't even start anymore) **To Reproduce** Steps to reproduce the behavior: 1. docker exec -it npm bash 2. ping google.com **Expected behavior**  It should resolve the hostname **Screenshots**  The result of ping google.com: ![image](https://user-images.githubusercontent.com/22529815/120011924-1f611380-bfdf-11eb-8a76-572c938f248d.png) **Operating System**  Ubuntu 20.04 **Additional context**  I have a pihole on the same machine as npm. The host naturally can ping Google without any problem. The error it throws that doesn't allow npm to start: ``` [5/28/2021] [4:00:41 PM] [Global ] › ✖ error Command failed: pip3 install certbot-dns-cloudflare==1.8.0 cloudflare WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f5d160>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/ WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f7df10>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/ WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f7df70>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/ WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f65f10>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/ WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.HTTPSConnection object at 0x7f3a92f5d370>: Failed to establish a new connection: [Errno -3] Try again')': /simple/certbot-dns-cloudflare/ ERROR: Could not find a version that satisfies the requirement certbot-dns-cloudflare==1.8.0 (from versions: none) ERROR: No matching distribution found for certbot-dns-cloudflare==1.8.0 ``` And finally this is my `docker-compose.yml` file: ``` version: "3" services: app: image: 'jc21/nginx-proxy-manager:latest' container_name: npm restart: always ports: # Public HTTP Port: - '80:80' # Public HTTPS Port: - '443:443' # Admin Web Port: - '81:81' volumes: - ./config.json:/app/config/production.json - ./data:/data - ./letsencrypt:/etc/letsencrypt ``` --- **What did I try?** I tried to set the dns value in the docker-compose file to my DNS server, there was no difference.

kerem

2026-02-26 06:35:02 +03:00

closed this issue
added the
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kerem commented

2026-02-26 06:35:03 +03:00

Author

Owner

@Knocks83 commented on GitHub (May 28, 2021):

Update: I cannot log in the webinterface (it says "bad gateway") but it does work (it's properly redirecting my domains).

@Knocks83 commented on GitHub (May 28, 2021): Update: I cannot log in the webinterface (it says "bad gateway") but it does work (it's properly redirecting my domains).

kerem commented

2026-02-26 06:35:03 +03:00

Author

Owner

@Knocks83 commented on GitHub (May 28, 2021):

I fixed it by adding the dns value in the docker-compose file, but instead of using pihole I specified the Google DNS

@Knocks83 commented on GitHub (May 28, 2021): I fixed it by adding the dns value in the docker-compose file, but instead of using pihole I specified the Google DNS

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