Hi,
To better understand your issue, please confirm the following information:
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If we create another type project, does it have same issue? We need to narrow down the cause of this issue.
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Did you install any antivirus software which could prevent Asp.Net Development Server? If so, you can try to reconfigure your antivirus software.
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If we use another browser such as FireFox, does it have the same issue?
I look forward to receiving your test results.
Thomas Sun
Microsoft Online Community Support
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