port for the debugger problem

Hi,
I have been trying all afternoon to debug a jar that i have built with a custom ant script in the IDE. but no matter what emulator I use it returns telling that “failed to establish a connection to the target vm at 127.0.0.1:2027 using socket transport"

Does anyone have any ideas as to why this is or a way to fix it?

I can't change the port value since it seems the plugin automatically takes this as its default value.

Please help,

Conor