Finding URL for UCSC data hub
Check your webserver functions from the top down.  You can do this from any WEB browser, even one that is on the webserver system itself.  For example, does this link function:
  http://webserver-id/
and provide you with a home page for that WEB service ?  If not, then there
is not apache WEB server on that system, or is mis-configured.

Next, depending upon how that Apache is configured, try this URL
  http://webserver-id/~username/
which would be a normal way to get to user directories via Apache.
This would actually be looking for a special directory in your HOME
directory, perhaps something like $HOME/public_html/
You would need to place something in public_html/ to access, for example
a tiny WEB page:

&lt;html&gt;&lt;head&gt;&lt;title&gt;my home directory&lt;/title&gt;&lt;/head&gt;
&lt;body&gt;&lt;h1&gt;hello world&lt;/h1&gt;&lt;/body&gt;&lt;/html&gt;


If that works, then you need to place your hub files in this
public_html/ directory.