PlayStation 2 + hdld_svr 0.90 - Suddenly no connection to HDL Dump Helper GUI v2

Hello.

Today I set up a second PlayStation with HDD/Network.

Playing Games with Open PS2 Loader works over Network.

But for no apparent reason I no longer get connected with HDL Dump Helper GUI v2 and hdld.svr-0.9.0.

Changing to 0.8.5 that connection works.
Changing back to 0.9.0 - no connection.

I use the SAME Memory Card with Free MC Boot on both PlayStation with identical Settings (for starting Tools/Applications).
I have this issue on BOTH PlayStations.

I...

PlayStation 2 + hdld_svr 0.90 - Suddenly no connection to HDL Dump Helper GUI v2