Solutions:
- Starting SDK manager as Administrator
- Starting android.bat from command-line.
- Updating Eclipse ADT from
help/check for updates
.
- Disabling windows firewall from
Control PanelSystem and SecurityWindows FirewallCustomize Settings
- Clearing download catche from tools/options in SDK Manager.
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
- If any of above solution does not work then the last solution
remained is to disable firewall of your antivirus.
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.
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