Upload Failure Connection failure in upload operation

Question

I am using Windchill PDMLink Release 12.0 and Datecode with CPS 12.0.2.7

Some of users started to having problems with uploads of their data.
Most crucial is a case when user (using NX+WGM) is not able to upload larger CAD data (the smallest file we noticed he cannot upload is only 82MB) when working from home and always gets an error: Upload Failure Connection failure in upload operation
But smaller files upload immediately. We couldn't find anything in log files, we tried different replicas and master server as well, we tried different gateways but everywhere the same, certain files simply won't upload.
The error points to network connection issues, but we were connected remotely to the machine, sharing screen and it worked fine all the time.
Strange thing is the upload fails almost exactly after 14 minutes, although timeout on the server is set to 15 minutes. Just because of this case we increased it to 20 minutes, but it made no difference. Sadly the engineer has plenty of locally edited data already so he would prefer not to creating new workspace.
Could you advise, please?

Here are the errors that I faced 
Upload Failure Connection failure in upload operation

joe_morton · Answer

It’s very strange to me that an 82MB file would take even more than a few minutes to upload. I don’t have a solution, but some ideas to try:

Try to enable logging from the users’ side. Maybe there will be some clues there: https://www.ptc.com/en/support/article/CS140107?source=search

I’d also review the guide here for low bandwidth connections: https://www.ptc.com/en/support/article/CS322300?source=search

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