I have been trying to upgrade Magento from 1.9.0.1 to 1.9.2 for a few days but every time I try I get the error:
Package community/Mage_All_Latest failed: Cannot connect to host: connect20.magentocommerce.com
Any ideas what could be causing this?
Could be a lot of issues. I should start by checking if there might be something wrong with config files in your downloader folder. I would compare it to another to see differences. If it doesn't work i suggest an upgrade by SSH. Here's a step by step tutorial about that.
http://firebearstudio.com/blog/upgrade-to-magento-community-1-9-by-ssh.html
I had this same problem and it was related to the URL path in Admin/Connect Manager
. Here's how to fix it:
https://stackoverflow.com/a/36926666/6269028