wcf - IISExpress: Unable to automatically step into the server. the remote procedure cannot be debugged -

i'm hosing webservice in iisexpress , can browse endpoint using browser know alive. i'm writing test application in winforms , want call method on service.

when try , step call, error.

iisexpress: unable automatically step server. remote procedure cannot debugged.

the webservice set in debug mode, i'm wondering there setting preventing iisexpress allowing debugging?

update: i'm wondering if because test app doesn't have .pdb files loaded memory these stored elsewhere within webservice folder, not test app bin folder. i've tried specify folder of bin folder app_code.pdb located webservices, still not luck.

so how done? i'm stumped.

update 2: still haven't been able work after week of looking it.

so here basic requirements: need 1) winforms app 2) able make calls different webservices , 3) able step each service call. services hosted sub-applications of root website using iisexpress. winform test app making web service calls, iisexpress started via nant task. webservices old web site type projects, have app_code.dll files. i've tried setting symbol paths point built pdb file, error along lines of:

"a matching symbol file not found in folder".

i never thought debugging webservices difficult?!?

1) reference dll of webservice in test project.

2) iisexpress different application winforms application, having dlls referenced still won't automatically allow step web service code. need attach iisexpress.exe process. when start winforms project, hit debug...attach process , choose iisexpress.exe. now should able step web service code.