Problem with certificate

  • Hi. I have a problem with letsencrypt certificate for my nexctloud. When i type in url: I receive a message which says: "This server could not prove that it is; its security certificate is from * This may be caused by a misconfiguration or an attacker intercepting your connection." I don't know why there is "*.". It is probably bad configuration of some config file, but I don't know which one. Any ideas?

  • You probably use duckdns as verification method. See the documentation of the letsencrypt/swag container:

    • For duckdns validation, either leave the SUBDOMAINS variable empty or set it to wildcard, and set the DUCKDNSTOKEN variable with your duckdns token. Due to a limitation of duckdns, the resulting cert will only cover either main subdomain (ie., or sub-subdomains (ie. *, but will not both at the same time. You can use our duckdns image to update your IP on
  • Yes exactly. So is there any way to fix that? If I use http validation method, I am getting an error:

    "Waiting for verification...,

    Challenge failed for domain,

    Challenge failed for domain,"

  • I think problem is beacause my router is using port 80 and port forwarding is working only from the internet but is not working from LAN.

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