Problems with DNS and random disconnects and

[IITuxtmuxII]

Hi I have a Problem with my Debain 11 client I use a Ubuntu 20.04 server with this script and my client when I want to test speed with a speedtest download works fine but If it starts with the upload test it disconnects and I have to restart the client on both vms I disabeled the firewall for testin, but no luck.

Does anybody know where I can find the logs? IITuxtmuxII