Can't save settings after copying site to new server I just recently copied a Drupal 7 site from one server to another, everything looks like it works fine except that I cannot save any settings.

Here are some other symptoms:


I can't disable or enable modules
Overlay doesn't work
Once I log out, I can't log back in
When trying to log back in with the wrong criteria, I don't get a message about the user/pass being wrong
admin_toolbar doesn't work (except immediately after clearing cache via drush)
Status report doesn't show anything being wrong


I've got varnish running on the server and I'm not quite sure if that would have anything to do with it.
I had to enable Mod Rewrite.
sudo a2enmod rewrite
If you're having this issue, also check that your .htaccess files copied over to the new server (I've wasted countless hours chasing this).