SFTP cannot connect to host

Weird issue here. Probably not DW's fault, but this seemed like the best place to start asking.
I'm using DW CS3 on a laptop running 64-bit Vista Ultimate, and it's connect via WLAN. On this machine I cannot connect to a site over SFTP. I get an immediate "Cannot connect to host" error. All normal FTP sites work fine. I also cannot connect to this SFTP site using CuteFTP on this machine.
However, on another PC, which is running XP Pro and is directly on the LAN (same network), I can connect to the same SFTP site successfully with DW CS3. The site settings are the same: I exported them from one machine to the other.
At first I thought it might be an issue with the Vista machine's Windows Firewall, but I disabled that, and got the same error.
I've Googled a bit for problems pertaining specifically to Vista and/or Wi-fi with SFTP, but so far no luck. I'd prefer to use the laptop as that is my primary work machine, but at least I can use the alternate PC to work on this site until I get this figured out.
Any ideas?
Thanks,
Greg

It definitely feels like a firewall kind of issue. Do you have a firewall set on either of your Dreamweaver installations? You can set this up in the Preferences panel (screenshot attached).
Hi Josh,
That's what I thought. So I temporarily disabled the firewall (Windows Firewall) on the laptop, but that didn't fix it. (The PC on which it does work has ESET's firewall.)
There's also a firewall on my D-LINK router, but its logs didn't show any blocking in real time.

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