I'm trying to generate a ssl certificate for my Portainer docker container. In the past this all went well, but after an update to my Synology NAS (DSM 7.1-42661 Update 4) I needed to re-instal the NGINX Proxy Manager running via docker (compose) (managed via Portainer). Adding a proxy host is fine, but when I want to generate a new ssl certificate, I get this error message in the Portainer log:
An unexpected error occurred:
requests.exceptions.ConnectionError: HTTPSConnectionPool(host='acme-v02.api.letsencrypt.org', port=443): Max retries exceeded with url: /directory (Caused by NewConnectionError('<urllib3.connection.HTTPSConnection object at 0x7f71df89d278>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution'))
My domain is: famwoolderink.duckdns.org (portainer.famwoolderink.duckdns.org)
My web server is (include version): v2.9.18
The operating system my web server runs on is (include version): Synology NAS (DSM 7.1-42661 Update 4), with Docker (20.10.3-1308)
My hosting provider, if applicable, is: duckdns
I can login to a root shell on my machine (yes or no, or I don't know): I don't know
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): Portainer (2.14.2)
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): 1.25.0
What can I do to solve this issue?
Thanks in advance