Good afternoon,
I'm currently running Telerik UI for ASP.NET AJAX R3 2023. I am using the RadAsyncUpload with a AsyncHandler.ashx to copy the file to a RadUploadTemp on a file share.
This has been working perfectly for ages but recently large file updates have been failing e.g. a 2.1 GB file failing at 61%. I'm being told this is due to a TCP Zero Window issue.
I assumed the chunked upload mechanism mitigates the issues caused by TCP window size restrictions, which can cause slowdowns or failures when uploading very large files in a single request. I am setting the upload ChunkSize value to 4194304.
I have the following settings in web.config:
<system.web>
<httpRuntime maxRequestLength="2097151" executionTimeout="18000"/>
</system.web>
<system.webServer>
<security>
<requestFiltering>
<requestLimits maxAllowedContentLength="4294967295"/>
</requestFiltering>
</security>
</system.webServer>
Have you got any ideas as to why it might be failing for larger files, or what I can do to the configuration to prevent the TCP Zero Window error by pausing data transmission until the receiver is ready to accept more data?
Kind regards,
Richard