Solutions:
- Starting SDK manager as Administrator
![enter image description here](https://i.stack.imgur.com/nZfCI.png)
- Starting android.bat from command-line.
![enter image description here](https://i.stack.imgur.com/0VW2N.png)
- Updating Eclipse ADT from
help/check for updates
.
![enter image description here](https://i.stack.imgur.com/ZfICX.png)
- Disabling windows firewall from
Control PanelSystem and SecurityWindows FirewallCustomize Settings
![enter image description here](https://i.stack.imgur.com/8kI9T.png)
- Clearing download catche from tools/options in SDK Manager.
![enter image description here](https://i.stack.imgur.com/YaMw4.png)
Adding Google's repository website in use-defined site from tools/Manage Add-on sites
in SDK Manager.
![enter image description here](https://i.stack.imgur.com/mRiZY.png)
Forcing https// sources to be fetched using http:// in SDK Manager
![enter image description here](https://i.stack.imgur.com/gw8uk.png)
- 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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