@Phaedrux @chrishamm @dc42
I ended up resetting my laptop OS and am now able to upload large files.

I appreciate all of you help and suggestions.

Ok, first off I want to thank this community for always being willing to help out.

I think probing that one point twice that @BoA pointed out was the issue. I updated my bed.g file and all seems good now.

@Phaedrux @chrishamm @dc42
I ended up resetting my laptop OS and am now able to upload large files.

I appreciate all of you help and suggestions.

@chrishamm thanks for this info, I can upload large files from another device, but it is my work laptop and I try to not use that for personal use.

I have both deleted the dwc-settings.json as well as reset the TCP/IP stack and the same error happens.

My microSD is a new one and I have tried one other as well.

@dc42 Thanks. Here is my .pcap file. Wireshark reveals just how much back and forth takes place between my laptop browser and the Duet. I tried to limit the packets capture to just the act of uploading but that was hard. I believe the upload is initiated at the TimeStamp: 738 21.597390

UploadFail.pcapng

@dc42 I have been able to isolate the isolate the traffic to the Duet. I can see lines of info colored Red and Black amongst the green.

I am just not able to interpret the lines for meaningful errors.

@dc42 , I have been learning wireshark and have done some testing. I am not sure yet how to detect errors associated with network connections, but I know how to isolate the capture between my laptop IP and Duet IP. I now see that any file under about 1.5MB never gets to the POST command. Any file under that threshold uploads fine and I see the POST command.

Any recommendations on what to look for in the capture that might indicate a network issue? I am familiar with HTTP response codes due to my day job, but I am not a network engineer.

@dc42 , thanks I will give that a try tonight or tomorrow.

@Phaedrux I just tried uploading from another computer and it worked. I have cleared the cache on the original computer's browser (Chrome), but that did not seem to help. I'll try again and another browser.

@bdelia I am at my wits end and am thinking I may need to replace the board...but everything seems to work with the exception of uploading files bigger than about 1.4MB. The uploads consistently fail, it is not intermittent.

@bdelia I just enabled logging of events via M929 P"eventlog.txt" S1, but the resultant log on shows the following after trying to upload a file that failed and caused the network error.

2025-03-08 09:41:49 [info] Event logging started at level warn
2025-03-08 09:41:49 [info] Running: Duet Ethernet 1.02 or later: 3.5.4 (2024-11-24 10:43:42)

@Phaedrux I just tried another SD card, 8GB. I formatted it first and then copied the contents of the original card over. I still experience 'Network Errors' when uploading a file over about 1.5GB.

I tested another ethernet cable, the CAT5 that was connected and it made no difference.

Are there any logs that the board outputs other than the Console output in the web client?