I do not think that reinstalling is nescessary. Did you solve the compile problems above?
1)make sure that you install from e.g. /tmp or /usr/src, installing from directories like /home/admispconfig or /root might be problematic.
2) Configure your server as described in one of the perfect setup howtos.
3) To use the remoting framework, it is not nescessary anymore to install a ioncube encoder as you might have read in older threads.
4) If you will be sure that you do not get trouble with ssl certificates when you connect to the remoting service, choose "http" when you install ispconfig and not 'https'. This will make it easier to debug things and we can be sure that your problems are not caused by missing SSL support in the PHP that you use on the client side for your soap script.