well in your var/log directory of magento2 root directory.
there should be a logs file like exceptions.log , system.log etc. so check is there any error showing over there or not !!
also which magento 2 version are you using ?
If anyone has suggestions on these settings please feel free to let me know. Thank you fabio_alves1 for posting this solution. Saved me so much time and frustration.
Hello! I hope all of you are doing well.
I know, i'm a new member and reviving an old post is not the right way to start in a forum, but i have found a really simple solution that i wanted to share with you guys.
Since the last few days this same issue freaked me out, and today i found a possible solution that worked well on Magento 1.9, and i assume that may work well on Magento 2 as well.
Basically, in the Magento's root folder:
rm -rf var/ mkdir var/log mkdir var/cache chown -R www-data var/ chgrp -R www-data var/
The issue may be related to the ability of writing on the var directory, or for creating the log, cache files, etc.
I hope that this helps somebody else.
Thanks and Regards,