I have a WebApp that uploads files to a server, but it is not working in a Google VM with Windows Server 2016 and IIS 10 to files larger than 1MB. It works on others servers with IIS8.5 and WS 2012. When I try to upload, it takes a lot of time, returns a success message, but the file does not go to the folder on the server.
That problem does not occours when I access my webapp from the server itself or another Google VM. It looks like a firewall problem, but I do not found anything different there.
There is some different configuration on WS 2016 or IIS 10 that explains Why it is happening?
I found a VPN that had been disabled, but still blocking the connections. I just remove the VPN and all start to work.