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vb.net FileUpload limit under Windows 2016 IIS (Running on ARR Load Balance Web Farm 2-IIS Servers)

Hello All;

Windows 2016 IIS ARR Load Balance Web Farm.
Containing 7 Servers in all, including "2 - IIS Servers".
(Could this be the cause of the limitation, explained below?)

OK, Running my upload file script under Windows 10 IIS, I can upload up to 20 files at one time.
Running this same script under Windows 2016 IIS, I can upload a max of 2, sometimes, 3, files at a time.
If I try to upload more than that, I get

404 Error, the page cannot be found.

So, what gives?

web.config

<system.web>
<httpRuntime maxRequestLength="1073741824" executionTimeout="3600"/>
</system.web
  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="1073741824"/>
      </requestFiltering>
    </security>
  </system.webServer>

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What do I need to check on within IIS on the 2016 Server(s), to make sure they allow for more than the 2-or-3 file upload issue?

Thanks
Wayne

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Ryan Chong

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Wayne Barron

ASKER

For starters, I would like to kick myself in the BUTT for not remembering to set up the error pages to send details to the browser.
This is something that I do from the start but had forgotten about this part.
I do in without fault for the ASP Classic errors to the browser, but I forgot about the ones for IIS.
OK.
This is what I get.

Most likely causes:
Request filtering is configured on the Web server to deny the request because the content length exceeds the configured value

Things you can try:
Verify the configuration/system.webServer/security/requestFiltering/requestLimits@maxAllowedContentLength setting in the applicationhost.config or web.config file.

For the solution right here.
https://docs.microsoft.com/en-us/iis/configuration/system.webserver/security/requestfiltering/requestlimits/

Thanks once again, for helping me out, Ryan.
I have it all working now.
I have it set to upload almost 100mb at a time, which is good enough for what I am needing to do.
So, now tomorrow, I can start filling the joker with content.

Wayne