What I'm getting from your post, is that you're having problems with the Slingbox connectivity.
In this case, you can discard any streaming / network restrictions preventing the Slingbox to work properly.
Besides that, I would recommend to check the following links:
Thanks for the response. Reading my initial post, I think I may have been a bit unclear when I was referring to my networks.
The slingbox is located at an address in the US. When I referred to my "home network" I was referring to my network in Singapore, not a LAN connection.
Does that change your recommendation?
Have you tried connecting with a laptop computer at another wi-fi location in Singapore, such as a MacDonalds restaurant, or Starbucks, or ...?
If the streamming works fine from these other locations, then I would expect that the problem is with your ISP -- either putting filters on video streaming data, or some other problem with your modem.
Since the streaming seems to work fine with your other devices that don't use your Singapore ISP, then i doubt that they problem is with any of the devices or service providers at the physical location of your Slingbox