Many people who quickly updated their WordPress sites to 4.4.1 were met with a rude surprise: Accessing the site's home page causes a redirect loop.
If this has happened to you then log in to your dashboard. Go to Settings->General. Make sure there are no uppercase characters in these two fields:
WordPerss Address (URL)
Site Address (URL)
These two values may also specified in wp-config.php:
If there is an uppercase character in these URLs then WordPress 4.4.1 will go into an infinite redirect loop