Debugging an existing error

I have an application with Swank loaded running standalone.

If the application gets an error and enters the Lisp’s native debugger, I want to be able to attach Slime to that Lisp and see the existing error in SLDB.

The application does a CREATE-SERVER on startup and I can use m-X slime-connect to connect to it. But, I only get a Slime REPL and don’t see how to point SLDB at the Lisp thread that’s already in the debugger.

If the above makes sense, can you suggest how to do what I want?

(The concept is that, if a customer ends up in the debugger, we can help him debug using Slime.)

Thanks,

- Gary