I know it's hard to believe but this is not a Pulseway app issue - and surely it's not under our control or we would have done something about it to fix it.
Try to take your Windows 8 device outside your network and see if it connects.
From our experience, and we had about 3 or 4 cases, it was always about the network settings. Also, edit your Windows 8 hosts file and manually add the IP / name there and try.
Hope this helps.
Marius