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What happens when you try to login with Internet Explorer?
You might check if any change has been made in the connection settings within the Internet Explorer.
To check that:
Open Internet Explorer.
Go to Tools.
Select internet Options.
Go to the Connection tab, click on LAN setting.
Check if any proxy setting has been changed in there.
If anything has been changed set it back to original settings and check if your issue is resolved.
If that does not resolve the issue try troubleshooting the Network Adapter from Network and Sharing Center.
In the search box, type
Troubleshooting, click Network and Internet, and then click the type of problem you are experiencing.
For more details about troubleshooting network problem follow the link given below.
Using the Network troubleshooter in Windows 7
Hope this information is helpful.
Microsoft Answers Support Engineer
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