I have been saying for some time that the windows compiled versions of the telescope servers does not work with the telescopecontrol program. The Dummy server works but the only telescope servers that work are those from Johannes original compile.
I have located where the problem starts by going back to earlier source code. Build 3875 works correctly but build 3876 does not. At this point a change was made to lx200connection.cpp as a win32 fix.
I have been compiling in windows using "export CROSS_GPP=J:/mingw/bin/mingw32-c++.exe" as my cross compiler but export "CROSS_GPP=J:/mingw/bin/mingw32-g++.exe" also works and produces TelescopeserverDummy.exe, TelescopeSeverLX200.exe and TelescopeServerNextStar.exe. The other servers are derivatives of these.
I can't read the code well enough to see what the problem is in the later lx200connection.cpp