you indicated an issue RDP to Win7 from Wyse S10.
we had same issue after upgrading from Wyse S10 v6 to V7.
Wyse would connect to WinXp, Win2003 terminal servers, etc but not Win7, Win2008 Terminal servers.
firewall or no firewall, could not connect.
Issue resolved on Wyse S10 OS, Connection Manager, Global Connection Settings, RDP tab, Uncheck Enable NLA box.
Lloyd