Threat Level: green Handler on Duty: Manuel Pelaez

SANS ISC Port Details:


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Port Information

Protocol Service Name
tcp CrazzyNet [trojan] CrazzyNet
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User Comment

Submitted By Date
Comment
Mike 2012-02-24 01:19:01
We've confirmed that Dropbox is sending out packets every 30 seconds on 17500. If you disable LANSync, it stops.
Steve Hicks 2011-01-16 11:55:23
We've had people on our LAN add an existing shared folder with dropbox and the speed that the files appear is LAN speed (5GB in 30 seconds). It clearly knows other machines with Dropbox and can sync folders on the LAN when available. I suspect this is a broadcast to detect peers
Todd Butler 2010-08-30 01:46:15
Yes, I can verify that disabling "Lan Sync" resolves the issue.
Getefix 2010-08-04 01:06:27
Yep, disabling LAN Synch in the Dropbox preferences seems to end this behavior.
2010-05-27 02:00:55
I think it is the Lan discovery feature of Dropbox. It allowed the different computers to synchronize over the Lan instead sync. from the wan access... (save much wan bandwidth).
2010-03-21 00:07:08
Dropbox uses this for their "LAN Sync" feature. I have confirmed that if you turn the feature off, the broadcasts stop.
Rex 2010-01-13 00:09:08
Correction to previous comment: This behavior is *not* documented on their web site, ...
Rex 2010-01-12 00:05:10
Dropbox https://www.dropbox.com/ broadcasts on port 17500 every 30 seconds 24 hours per day for unknown reasons. This behavior is documented on their web site, but when we removed Dropbox from a Windows system, the broadcasts stopped.
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CVE Links

CVE # Description