how can I view redirected client printers?

I am trying to troubleshoot client printer redirection. But I cannot see my clients printers when they sign in. Also, I am trying to troubleshoot how group policies is affecting clients using my remote desktop server but when I try to use GPRESULT /s /system /user username /v I get a "ERROR the RPC server is unavailable" message. the server is 2008 R2 and does have the printer manager role. 

it would be extremely helpful if I could see who is an isn't able to bring their printers with them when they sign in.

thanks in advance