Problem viewing streaming video in some wifi networks, but not others

When I am at work (university), I can not view YouTube videos or video streaming from news sites such as cnn mobile on my ipod touch 2g.
<m.cnn.com/videos.jsp?ckey-cnn)06#__1_>
When I called Apple support, they had me reset-restore. I still had the problem. I went to the Apple store Genius bar and the problem no longer existed, the videaos downloaded and played from both sites!
But at my diner and at work, I get the message, "This movie could not be played" in a popup box with an OK button. The same message appears if I use the YouTube application. I click on any video, and the same popup appears. In Cnn the popup is preceded by a shaded capital Q that looks like the blue Quicktime Q; in Youtube the pupup is preceded by a YouTube icon in gray with the "Tube" surrounded by the rounded rectangle, their icoon...
At the Apple store the popup never appeared, and the videos downloaded and played.
I have no trouble playing movies I have downloaded from iTunes.
I did not have this problem when I initially got my iPod Touch, and I think it appeared after one of the last two system upgrades, but I am not sure.
I am curious that it the problem happens at two places, my diner and at work.
The speed of my wireless work network, as judged by the ipod app speed test is 9915 kbps download and 6971 kbps upload, so plenty fast.
The first time I noticed this issue was with the application "At Bat Lite" which also won't play video highlights at work.
I do not have WiFi at home
Any thoughts about what would cause this lack of functionality apparantly only at some networks but not others?
Oh, one more piece of data: at work a Macbook will play YouTube both on ethernet and using wifi...
Thanks for any thoughts or suggestions,
Paul

It seems I have two networks available at work, one is behind our firewall, and I login to it. This is the network that I can't view streaming video. There is also a "Guest" network that I don't need to login to. This one works with the YouTube and the news site videos.
Thus, I conclude there is a setting that WiFi network administrators can invoke that specifically can block streaming video on some protocols (whatever the ipod touch uses) and not others (whatever the Macbook uses). But the same router hardware supplying the Guest network does not block these protocols. Presumably this has to do with security on one side of the firewall(?)
Anyway, apparently outside of the WiFi controls available in the ipod touch settings.
Weird...
Paul

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