I understand that you are having some issues in order to set up your Slingbox SOLO for Internet Viewing.
If you are able to locate the Slingbox SOLO on your network, but you are getting now the Internet access error message, the issue might be related to the security software running on your computer. Most of the times, the Slingbox and the SlingPlayer are categorized as "threats" for the security software.
In this case, I recommend you to think about two options: use a different computer and see how the Slingbox works on it or contact your security software provider in order to know how to allow the connection to your Slingbox through the local firewall.
Hope this helps.