mini SAP ABAP version cannot connect

I recently installed the mini SAP sneak preview and had it working on my laptop as of last week. Today it doesnt work, giving me the following error:

**************************************************

Sapgui 640 [Build 8971] Tue Nov 22 15:41:32 2005

: 'partner not reached (host 10.10.0.10, service sapdp00)

Time Tue Nov 22 15:41:30 2005

Component NI (network interface)

Release 640

Version 37

Module nixxi_r.cpp

Line 8602

Method NiPConnect2

Return Code -10

System Call SiPeekPendConn

Error No 10061

Error Text WSAECONNREFUSED: Connection refused

Counter 1

It apparently doesn't matter whether the central instance is running or not. What puzzles me is what could have changed between last week and this during several reboots.