I Can't access / ping a workstation joined to domain
WS1 Windows 8.1 Pro - This don't respond to ping with name or IP.
WS2 Windows 7 Pro
S1 Windows Small Bussiness 2011 = DOMAIN CONTROLLER
All WS in the same Windows domain
User: Domain Administrator
From WS1 can ping WS2 and any WS in domain
From any other WS, including WS2 and S1 can not ping WS1
WS1 is visible in a network window, but isn't accessible.
I already verified the firewall on WS1.
I configured LSHOSTS and HOSTS on WS2
WS1 worked OK until 10-12 days ago.
Many thanks for any suggestion.
Alex