Why is RTSP now being blocked on my Mac?

I was trying to play a streaming video from CSPAN and all of a sudden it stopped working. I can no longer play streaming videos either with a plugin or directly using either Real Player or Quicktime. Well, I can play videos as long as they use an http address or URL, but RTSP no longer works. Is my firewall suddenly blocking it? Can't play them using Safari either.
Here's the address I was attempting to connect to:
rtsp://video1.c-span.org/archive/arcbtv/arc_btv0621084.rm
I just get a message that there's a network problem. I'm using an Airport Extreme base station, but until today everything was working fine and there was no problem with this protocol. Has something been reset?

Ok here's what finally worked for me with getting rtsp streams to play directed from C-Span. (The only site I am aware of that this didn't just automatically work.)
This is all first assuming one is using Airport Extreme, and running Leopard 10.5.4, (though I imagine it would work on 10.5.3)
Make sure Safari or your Browser is not running. Quit it if it is.
If you are not using Airport, try skipping to step two.
_Step One: Reconfigure your Airport Extreme._
Go to your Utilities folder, (Applications/Utilities), and open: *Airport Utility*.
Double click your base station name in the left column.
This will open up the configuration you have for your base station.
Make sure you are on, "Airport," on the top tab of the configuration page.
This will open up four tabs below it, click on: "Wireless," the third tab from the left.
Here I had pre selected: *802.11n (802.11b/g compatible)*
I changed this to: *+802.11n Only (2.4 Ghz)+*
Then I clicked on: Update.
This takes a minute or two.
_Step Two: Change Real Player Preferences_
Open Real Player, open Preferences, (through the Real Player menu or by holding down: "Apple Comma")
Click on the: "Transport," tab on the top of the preferences window.
Check: *Use manually configured RTSP and PNA transport settings*
Click on: Configure.
In pop-up window click: *Use HTTP Only*.
Click: OK
Close preferences, and just to be sure, quit real player.
Re-start Safari, or your Browser, navigate to C-Span, and try one of those rtsp links.
If you are like me, you are in for a pleasant surprise.
After months of not being able to watch C-Span, rtsp streamed archives, it now works!

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