There is a way to do that but both the SP 2.0 and 1.5 are no longer supported by Sling Media. Which means you won't get any help from them here on that.
There are other sites that can help try this Google search
Thanks for the reply. I guess I should check, but is there a newer version of the Windows software that is supported, or did Sling abandon the Windows client? But I guess that's getting off-topic. My main problem is that I can't watch my home Slingbox because my office DNS provider is blocking access to Sling's site. Am I stuck with using SlingPlayer 1.5 or is there something I can do with newer software to get a direct connection to my Slingbox?