Installing Drupal

Hi

I have installed a dev version of my Drupal site into "/home/user/public_html/dev/drupal/" -> http://dev.drupal.tld

Live version of this site is installed into "/home/user/public_html/" -> http://drupal.tld

Live version is working fine but dev version (copy of live) isn't and problem is that I can't login to that site (drupal notice: access denied).
The problem seems to be in cookie that appears to be missing and I haven't figured out why and how.

Hi I installed Drupal 8 (followed instructions except for clean URL, I wanted to do it after the installation through the configuration menu in admin) until I got the message drupal successfully installed. BUT for some reason when I click on any link from the admin or site page I get the following error:

Not Found
The requested URL /Drup8/user/1/edit was not found on this server.

Looked at the installation guide with no success. Just the site name and the Drupal links do work.
Any ideas why is this happening.
Thank You.

Two errors :
PHP register globals Enabled ('1')

Unicode library Error

Tried almost all solutions on web, none success including php.ini and .htaccess method.

I keep a server on AWS
I have a computer with Multi site setup
I initially installed a regular Drupal and added subdirectories under …/sites/ with name of the domain such as “sample.com” I keep installing web sites in the same way and until now everything went OK.
Last few days I tried to install additional sites and came across a message (warning ) of something in line 1 of setting.php

I installed drupal within a subdirectory (not at the root), and now I want to move it to the root. I've enabled Backup and Migrate, but the restore option only seems to restore to the place I backed it up from. What am I missing? It's not called Backup and Restore. The name implies that it can allow the site to migrate, but I need help. I've watched videos, read the documentation, yet nothing mentions the setting that points to the new home (migrate to option). Thanks for any tips!

Updated a site to 7.37 and now I'm getting blank pages on admin pages. Status report is fine, no errors (/admin/reports/status). If I go to /admin/modules I get a blank page. If I try to add content (/node/add) the page loads fine however if I choose basic page (/node/add/page) I get a blank page. Any ideas what went wrong?
Thanks.