# Cannot upgrade / send emails / fetch themes... Docker problem? **URL:** \ **Category:** Product Support\ **Created:** [February 28, 2025, 10:18am UTC](https://meta.discourse.org/t/cannot-upgrade-send-emails-fetch-themes-docker-problem/355006 "2025-02-28T10:18:13Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![Paracelsus](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/paracelsus/32/164912_2.png) [@Paracelsus](https://meta.discourse.org/u/Paracelsus)\ **Post date:** [February 28, 2025, 12:34pm UTC](https://meta.discourse.org/t/cannot-upgrade-send-emails-fetch-themes-docker-problem/355006/3 "2025-02-28T12:34:18Z")
Ok, so: on host DNS: ```plaintext #resolvectl status|egrep Servers DNS Servers: 8.8.8.8 Fallback DNS Servers: 8.8.8.8 DNS Servers: 8.8.8.8 8.8.4.4 ``` ```plaintext #nslookup github.com Server: 8.8.8.8 Address: 8.8.8.8#53 Non-authoritative answer: Name: github.com Address: 140.82.112.3 ``` On Docker DNS: ```plaintext #docker exec -it app bash -c "cat /etc/resolv.conf" # Generated by Docker Engine. # This file can be edited; Docker Engine will not make further changes once it # has been modified. nameserver 8.8.8.8 nameserver 8.8.4.4 # Based on host file: '/etc/resolv.conf' (legacy) # Overrides: [nameservers] ``` ```plaintext #docker exec -it app bash -c "wget -O - -v https://github.com/discourse/logster.git/ |wc" --2025-02-28 12:20:17-- https://github.com/discourse/logster.git/ Resolving github.com (github.com)... failed: Temporary failure in name resolution. wget: unable to resolve host address ‘github.com’ 0 0 0 ``` P.S: Our host operates in Canada. --- _[View the full topic](https://meta.discourse.org/t/cannot-upgrade-send-emails-fetch-themes-docker-problem/355006)._