How big is the file? I had this problem the other day go into your IIS setting and change the time-out properties and Request Queue time-out to be longer.. Now if you use a host this may be a little bit more trouble.. I would recommend scaling down the file size so it loads quicker..
My file size is 6.7 MB.
From the experiment below, I can drop my file size by using FLV instead of FL4. I can also drop the file size by half going from 1280 to 960. Do these numbers look reasonable for a 20 sec video?
1280 x 720 HQ FLV (6,675 KB)
1280 x 720 MQ FL4 (6,707 KB)
1280 x 720 MQ FLV (4,471 KB)
960 x 540 HQ FL4 (4,537 KB)
960 x 540 HQ FLV (3,215 KB)
960 x 540 MQ (2,617 KB)
640 x 480 Std HQ FLV (2,766 KB)
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Yes they look ok.. I've had a hard time playing FL4 files off my webserver for some reason but fine with FLV files.. not sure why and i'm running IIS 7.. when encoding there is an option when you go to File>Export and there is a list of diff formats for the web.. they actually say web on it .. they should help and you should be on your way!