It recommended to use postgres or another database for development. HSSQL is only for demo's.
I have gone through one other question in Forum link for the same is below :-
https://forum.mendix.com/link/questions/101385
I have the exact same issue , I now understand the problem is with HSSQL DB using 9001 Default port.
In one of the solution it was mentioned that IGCC was using 9001 and Killing the service allowed HSSQL to run.
In my case websocketservice.exe using port 9001 and it cannot be deleted , so my conclusion is I need to change the default port of HSSQL DB to solve the issue , and still can’t figure out from where it can be done .
Hope anybody knows how to do that.