I have a Windows 10 laptop and Ubuntu Server 16.04 setup on my home network. Previously, I've been using Putty to connect via SSH from Windows to Ubuntu without a problem. Today, however, my Windows machine can no longer find the Ubuntu. Both machines are on my home network and are both automatically assigned IPs. I cannot ping the Ubuntu Server from Windows.
I can, however, still connect via SSH to the Ubuntu machine from an app on my phone, and I can still connect remotely through VPN to the Ubuntu machine, so I'm thinking this is a problem with the Windows machine. I was last able to do this two days ago, and the only change that would have occurred on the Windows system is the installation of definition updates for Windows Defender.
Any suggestions would be appreciated!