Can't see networked computer in the finder's network window.

I can no longer see my MacPro from my MBP in the finder's "Network" window.
I can still connect using "Connect to Server" and typing the IP manually.
From the MacPro I can see the MBP just fine.
I repaired permission, ran cocktail etc...
Any ideas?

I can no longer see my MacPro from my MBP in the
finder's "Network" window.
I can still connect using "Connect to Server" and
typing the IP manually.
From the MacPro I can see the MBP just fine.
I repaired permission, ran cocktail etc...
Any ideas?
Apple uses a service called "Bonjour" to discover devices on a network. Bonjour piggybacks on the mDNS service, meaning it broadcasts on port 5353. Apple is sensitive to being called "chatty", because it's past device discovery methods were indeed chatty. Bounjour has built in some passivity, and devices will delay their broadcasts if logic detects they're not needed. Sometimes all it takes is clicking on the Network tab.
It all boils down to 1 of 3 things:
1) The MacPro is not sending out Bonjour discovery packets.
2) The MacPro is sending out Bonjour discovery packets, but the discovery packets are not reaching the MBP. This is highly doubtful, since the process is working in the opposite direction.
3) The packets reach the MBP but it's not responding to them.
There's a great (and free) utility called Bonjour Browser, and it's available on versiontracker. If you run it on the MBP, you'll have a much better ideas as to what's happening.
My best guess is that the MacPro is not sending out packets. This would either be due to not having anything to share (File Sharing turned off) or logic which dictates that it's been sending out these packets for a long time so they're delayed for 30 minutes to reduce chattiness.
Powerbook G4, iMac (Intel), and tons of hardware sitting in the closet   Mac OS X (10.4.8)  

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    I can no longer see my MacPro from my MBP in the
    finder's "Network" window.
    I can still connect using "Connect to Server" and
    typing the IP manually.
    From the MacPro I can see the MBP just fine.
    I repaired permission, ran cocktail etc...
    Any ideas?
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