EX2100 unstable SMB file transfer over VPN


I’m am trying to access and copy files via SMB (Windows 10) over a VPN (Lancom) form a EX2100. It works on smaller sub 2MB file, but anything larger results in a timeout.

Using the utility LANspeedtest I can write and read large files to the EX2100 without any problems.

Copying files from a Windows Server via SMB at the same location over the same VPN works.

Is this a Windows 10 thing or does anyone have any ideas?