I have a vagrant box with a Magento installation. My var folder is set to 777 (not recommended I know but I'm trying everything). When I try to login to the admin, nothing happens. I see empty session files in the var/session folder.

I have checked the following:

  • cookie domain in db (set to empty)
  • vagrant box server time equals my local time zone
  • use of localhost (I'm not using localhost, i'm using a local.XXXX.com domain)
  • cleared all my cookies
  • tried various browsers
  • tried incognito browser

I keep seeing this in the logs:

Warning: Unknown: Failed to write session data (files). Please verify
that the current setting of session.save_path is correct [path to
correct var/session folder]

but there are empty session files in that folder.

I tried deleting the session folder, and Magento creates it anew but with the empty session files.

I had the same configuration running perfectly, but I had to destroy and rebuild the vagrant box. That is when it started happening.

1 Answer 1


Turns out it had something to do with the version of PHP I was running (5.4.34). I downgraded to version PHP 5.3.3 (which matches our production box) and everything worked.


It just started happening again. I updated local.xml as follows:


Discovered here: https://stackoverflow.com/questions/26123081/failed-to-write-session-data-magento

  • This does not apply to Vagrant only, but also to VMWare Shared Folders. Session serialization failed silently for me. Thanks!
    – paul.ago
    Sep 28, 2018 at 12:21
  • That's funny, I use VMWare too so maybe it's just a VMWare issue?
    – Laura
    Sep 28, 2018 at 13:53

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