Hello,
could just be a Windows 7 thing. What kind of internet connection is this device on?
It’s possible to change the MTU on the zerotier network, but it’s not exposed in the UI. It’s very rarely a solution. But if it works for you and you want:
curl -X POST "https://my.zerotier.com/api/network/${NETWORK_ID}" -H "Authorization: bearer ${TOKEN}" -d '{"config": {"mtu": 1300}}'
You’ll have to leave and rejoin the network to get the mtu to change. You may have to restart the zerotier service.