# Cannot upgrade / send emails / fetch themes... Docker problem? **URL:** https://meta.discourse.org/t/cannot-upgrade-send-emails-fetch-themes-docker-problem/355006 **Category:** 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:** 1
### 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, 10:18am UTC](https://meta.discourse.org/t/cannot-upgrade-send-emails-fetch-themes-docker-problem/355006/1 "2025-02-28T10:18:13Z")
Hi, In the last days we started suddenly having an issue with sending emails… then we’ve tried to upgrade/update without success (the update page hangs and every component - docker, discourse, plugins - get stuck at “Checking for new version…”) and then we tried to update everything via root but the rebuild fails giving the following message (among other things): ```plaintext fatal: unable to access 'https://github.com/discourse/discourse.git/': Could not resolve host: github.com` ``` Our host has confirmed that there are no problems with the server connectivity, SSL, firewall or any other thing. I suspect is something with docker. Even checked this topic: [Docker sometimes fails to connect to github.com - Installation - Discourse Meta](https://meta.discourse.org/t/docker-sometimes-fails-to-connect-to-github-com/250643/2) and tried: ```plaintext # cd /var/discourse/ # ./launcher enter app # wget -O - -v https://github.com/discourse/logster.git/ |wc ``` and got the following: ```plaintext --2025-02-28 09:45:51-- 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 ``` Any ideas on how to address this issue? --- _[View the full topic](https://meta.discourse.org/t/cannot-upgrade-send-emails-fetch-themes-docker-problem/355006)._