Joomla升级2.5到3

Question

I am trying to upgrade Joomla from 2.5 to 3 but update button is not showing on administrator panel. It is showing “Joomla! is up-to-date”. How will I get update button. Following errors came when I try to troubleshoot.

I am not able to get response from update.joomla.org. Is it due to proxy applied on my connection. If yes then could you please let me know the step to overcome this issue.

When I get in touch to our technical support team then they provide me proxy URL with port number. Without any credential. And they told me that I have to surpass this URL after using the proxy URL. But I am not sure how I can use this proxy to get response. Please suggest and let me know the solution. Thank you!!

Errors : Update: :Collection: Could not open http:///update.joomla.org/core/sts/list_sts.xml ;

Update: :Collection: Could not open http:///update.joomla.org/core/jed/list.xml

Answer 1

Within the administrator area navigate to the 'Joomla! Updater' component (under Components) - when there click on the 'Options' button in the top right of the screen. When the pop-up appears, change the 'Update server' to 'Short Term Support' and click the 'Save & Close' button within the pop-up. Once closed, the updater component should go off and check for the latest version on the 'Short Term Support' branch. The text that said 'Joomla is up to date' should be replaced with the option to install the 3.5.1 version.

Make sure you take a backup before updating. Your template and other extensions may not be compatible with the 3.5.x branch so it's best to either make sure that they are compatible or find an alternative solution.