The new web server is online.

     If you are using memcached is your friend or wp fragment cache in your WordPress installation, you may have to de-install and re-install these for your site to work properly.

     Since these break your ability to login, you will need to go into shell, go to the root of your wordpress, then cd to wp-content, and then to plugins.  Use rm -r to erase fragment cache or memcache.  Then you will be able to login, delete them, and re-install and everything should be okay.