After upgrading my pair of Lenovo M720q machines from Proxmox VE 8 to 9, they randomly started dropping their connection to the internet. The only solution that seemed to fix it was to physically disconnect, then reconnect their Ethernet cables. Weird, right?
I am honestly not sure why this was happening, but I can offer a permanent solution in case you (or anyone else) encounters this same problem.
First, find the label for the physical Ethernet adapter for your system:
ip addr
For me, it was eno1.
The local address of your system might be bound to a virtual adapter (like vmbr0).
This is NOT what we are interested in.
We are interested in the physical adapter.
Next, disable TSO for the live system. Substitute eno1 for whatever you just found for the label of your Ethernet adapter.
ethtool -K eno1 tso off
To make this setting permanent, add a line to execute this on system boot to your /etc/network/interfaces/ file.
iface eno1 inet manual
post-up ethtool -K eno1 tso off
If you have this problem, this fix might work for you, and it might not. Either way, good luck!
Published September 27, 2026 at 3:41 PM
Proofread by Harper.
I have been seeing an increasingly prevalent trend of people showing up in online spaces flaunting that they are writing with the assistance of AI. They seem to be proud of this. They shouldn't be.
It didn't work for me, and if you reading this, it probably won't work for you either.
A complete or partial loss of function while reviewing the output of a coding agent.