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What research did you do to understand the alert and what is your question?
Sorry about the delay getting back. Had to finish up a research paper.
I did some Internet research. I could not find a manual that describes it but the impression I got from forums is that it relates to cloud based storage which I don't have. I simply have two servers on my network. Would it be irrelevant to my situation and should it be disabled? Thanks.
A web server shouldn't run a Desktop Environment in the first place. If you want to stay with Ubuntu please check out the LTS release and do not install Xorg, Desktop Environment or any graphical tools that could draw in Xorg / DE as a depencency.
Thank for letting me know about Ubuntu LTS. I had not previously heard of it. My computer (c. 2001) was too old to handle any versions of Ubuntu later than 11.4 - possibly due to not being able to handle LightDM. So I would need to use 10.04 LTS which would have support for server until early 2015 and no longer has support for desktop. I am thinking of trying the latest stable release of Debian or CentOS instead if my computer can handle it. If it handle CentOS, I should have support until the PC is over 20 years old if it lasts that long.
comes with the latest stable version of Debian. The WireShark log did not show port 17500 being used and that port was not specifically mentioned in iptables. Should I specifically block that port before I disable that warning (or sinstead of disabling that warning)?
No, the NSE file explicitly requires you to run it as 'nmap --script=broadcast-dropbox-listener' and then it's only a passive listener. The Snort sig is for clients broadcasting ("udp $HOME_NET 17500 -> any 17500"). So if no machines run a Dropbox client then the port shouldn't be in use and there's no need to block it. FWIW /etc/snort/threshold.conf (if still in use?) [c|sh]ould hold suppression rules.
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