Error Net::err_connection_reset: Connection reset

When debugging the ASPNET program locally, 360 browsers have this problem:

This page cannot be displayed
The connection to the localhost has been interrupted.
Here are some suggestions:
Please reload this page later.
Please check your Internet connection status and restart any routers, modems, and other network devices that you may be using.
Add "360 Speed browser" as a permitted program to your firewall or antivirus software settings. If it is already a permitted program, try removing it from the list of allowed programs, and then adding it again.
If you use a proxy server, check your proxy settings or contact your network administrator to ensure that the proxy server is working properly. If you think you should not use a proxy server, adjust your proxy settings: Go to Wrench menu > Options > Advanced Options > Change proxy settings ... > LAN settings, uncheck the Use proxy server for LAN check box.
Error Net::err_connection_reset: The connection has been reset.

Finally found that the FileUpload control problem, when uploading files, webconfig profile default upload file size is 4M, so greater than 4M will appear above the error, and even if the program set a breakpoint, can not debug.

To modify the Webconfig file:

<system.web>
</system.web

Here 153600 indicates that the uploaded file is up to 150M and expires at 1200 seconds.

To solve this problem.