My Android SDK manager starts and then tries to fetch new updates. But it can't fetch content and shows following error in log window:
Failed to fetch URL
reason: Connection to https://dl-ssl.google.com refused
help/check for updates.
Control Panel\System and Security\Windows Firewall\Customize Settings
Adding Google's repository website in use-defined site from
tools/Manage Add-on sites in SDK Manager.
Forcing https// sources to be fetched using http:// in SDK Manager
Some antivirus packages like Avast contains their own firewalls that blocks fetching content in SDK manager. You must have to disable antivirus firewall from its settings.