We did our best to reproduce the problem on our side, but to no avail. We really shoot in the dark here and we ran out of ideas what might be causing the problem. The fact that everything works as expected on our end makes us believe that the source of the problem lies somewhere outside the logic and behavior of the RadUpload
This is the list
of the most common issues that our clients usually encounter with the RadUpload. Can you make sure that in the cases when the issue is reproducible the reason isn't related to the scenarios described in that list.
Also, from what you shared with us, it seems that whenever the user has the right credentials, the UplaodHandler can be reached. Is it possible during the VPN session those credentials to be lost due to connection errors?
All the best,
the Telerik team
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