I did an upgrade from Magento CE --> 1.9.1 in my staging environment The frontend is just working fine but the backend gives me the headache. * I can't login. It only shows a white screen and no errors.

I've read that this could be caused by bad themes or plugins. So install it once again in and setup the default/deafult theme and remove all the plugins (set to false in /etc/modules). Did the upgrade once again but sadly with the same result.

I followed the hints on this page: Fundamentals for debugging a Magento store but still no login possible and neither clues or errors.

I've a log-file during the upgrade and all seems well but 2 issues:

    Checking dependencies of packages
Package community/Mage_Core_Modules failed: Detected Mage_Core_Modules conflict of versions: and
Installing package community/Mage_All_Latest
Package community/Mage_All_Latest installed successfully
Installing package community/Interface_Adminhtml_Default
install: Failed to open file /home/schapenv/public_html/staging/downloader/.cache/community/Interface_Adminhtml_Default-
Installing package community/Interface_Frontend_Default

Is this a clue why I can't login?

  • Have you tried to do the upgrade by copying the new files using SCP or FTP? – brentwpeterson Jan 23 '15 at 14:12
  • No but i did a complete install / upgrade and now it all went well – Peter Jan 25 '15 at 11:22
  • Can you write out your answer so it closes the post out – brentwpeterson Jan 25 '15 at 18:34
  • sure but how or where? – Peter Jan 25 '15 at 20:23
  • You can answer your question in the Answer Question box lower down on your screen – brentwpeterson Jan 25 '15 at 22:33

I didn't have a solution but after a complete install / upgrade all worked well now

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