Juan,
If you are using Personal web site, it only allows limited connections. When open one window of IE, it will uses two connections. Please close all connections then try again.
If you are using IIS, please change the connection limit settings for the Web site.
- Open Internet Services Manager.
- Right-click the Web site and choose Properties.
- On the Web Site property page, select Connections.
- Choose Unlimited or increase the Limited To: value.
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