Debugging on remote server

I have a webservice running on a remote server.  When I step into the code for debug, instead of code, I get assembly.

Any ideas how to setup a remote webservice so that the code can be stepped through?  There is clearly something I am not understanding.

Thanks,

Daniel

00000000 mov ecx,dword ptr ds:[02DA54E0h]

00000006 call 74F861A8

0000000b cmp dword ptr [eax+4],0

0000000f jle 00000018

00000011 mov eax,1

00000016 jmp 0000001A

00000018 xor eax,eax

0000001a ret
...