ASP.NET Core MVC web application : Excel download network error

Question

I'm getting a network error when trying to download an Excel file from my web application hosted on a remote server. The request returns 200 OK response in network tab and file downloads until 64kb (total 274kb), then it stops.

The site turns to service unavailable. I have log and trace in controller action but there was no errors. The Excel file downloads perfectly fine when I run the application locally.

I tried these solutions, but none of them work. If someone has any ideas please let me know.

In web.config file, we added maxAllowedContentLength and responseBufferLimit
I checked CPU, memory usage they are fine on server during download.
I disabled HTTP/2 on binding
I checked the MIME Type on IIS manager its showing correctly for .xlsx as application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
I checked Idle Timeout and recycle on application pool. They are fine.

Brando Zhang · Accepted Answer · 2025-01-13 02:34:40Z

0

I suggest you could firstly modify the web.config to modify the request filtering in IIS.

  <security>
    <requestFiltering>
      <requestLimits maxAllowedContentLength="524288000" /> <!-- 500MB -->
    </requestFiltering>
  </security>

Besides, I suggest you could modify the request limit inside the program.cs, like below:

builder.WebHost.ConfigureKestrel(serverOptions =>
{
    serverOptions.Limits.MaxRequestBodySize = 100_000_000;
});

answered Jan 13 at 2:34

Brando Zhang

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2 Comments

Nic Jan 13 at 16:08

I tried both in web.config file and adding MaxRequestBodySize in program.cs. The issue still remains. The download stops at 64kb and become service unavailable.

Brando Zhang Jan 14 at 2:18

I suggest you could try to enable the fail request tracing from this articleto see which module cut the connection.

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