Subnet mask is 255.255.0.0. Router defaults to that so it’s what I put in on all the machines I’m trying to connect. Devices are all on the same time and zone. I’ve updated all the machines as much as I can, though all three devices fail KB5034441 with download error 0x80070643, but this shouldn’t be the problem since they were doing this before the problem arose as well. Shouldn’t, but I guess it could be since this is Windows. All 3 (share device, main PC tested and verified prior to reconfiguration, laptop) are Windows 10 Pro 10.0.19045.4355.