I keep my PING limit for visible servers at 350 or below. Today I was unable to see the servers, even though Walker assured me they were on and rebooted them for me. Finally I reset my tech limit to 1000 PING. THEN the SAS servers showed with a " - " where the ping number should have been. Walker says this is likely a firewall issue.
So, to see these servers, reset TECH FILTER to FASTER THAN: "OFF".