Remote Desktop won't allow me to observe computers

The title basically says it: Remote Desktop will not allow me to see some of the computers on the network, for whatever reason. I have more than five computer labs, and the majority of the computers are completely accessible. However, for a select few, when I try to "Observe" or "Control" a message comes up saying, "Connecting to '(computer name)'," and it will never be able to connect: "Connection failed to '(computer name)'."
I have tried upgrading the client and both computers (this and the client) have every apple update so far.
It seems that even though I cannot control or observe them, I can still use Remote Desktop to install things, however.
Thanks in advance for your help!

The problem is, they are all connected to the same subnet, and they're all attached to the same switch and router; the controlling computer is also on the same subnet. The exact situation is we have a lab full of old eMacs (read: 700 MHz PowerPCs, less than 500 GB of ram) running Tiger 10.4.11. There are 24 of them; 6-24 all work properly, but 1-5 don't. I can still update them using Remote Desktop, but I can't "control" them.
I thought it could have been an issue with the switch (as in, things plugged into the wrong sockets, or even the wrong switch), but everything was in order. To make it worse, in another lab, this one with 12 computers, it's 1, 2, 5, 7, and 12 that are having the problem. Earlier, when I was working on a teacher's laptop, I couldn't get it to work on that, either. And I have tried running Remote Desktop from two different computers, and the same computers have the same problems on each.
I hope that didn't muddy the waters too badly.
Thank you for your response, in any rate.

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