Unable to access memory for x64 gdb debug stub

Hi:

I am trying to debug x64 win7 with gdb stub

Here is my setting in .vmx file.

debugStub.listen.guest64 = "TRUE"

debugStub.hideBreakpoints= "TRUE"

debugStub.listen.guest64.remote = "TRUE"

I am able to connect to 8864 port.

However, looks like the memory is not accessible(screenshot attached):

Any idea why?

I am using VMware Worksation 9 on WKS2008R2