ltm sharepoint site

our internal sharepoint server is 192.168.20.14 and resolves to sharepoint but only way I can get to sharepoint is if I put sharepoint/sites/BU then I am able to get in to sharepoint. I have the F5 and when I go to the VS 192.168.20.70 I get prompted for creds but I get: HTTP/1.1 200 OK Server: Microsoft-IIS/8.0 Date: Thu, 10 Apr 2014 19:56:27 GMT Connection: close

So I added an irule to append the URI /sites/BU and the F5 does append the uri but still no sharepoint. any thoughts? Not using APM