Lion and Netbiosd

Hi, I was getting to know what changed in Lion when I found that Netbiosd is set to Block incomming Connection under my Firewall Advanced Settings. I don't know what Netbiosd is or if I turned it to Block inadvertently or whether it is supposed to be set to Block. Could someone knowledgable about such a thing let me know what Netbiosd is? and is it correct or wrong to have it set to Block? But please do it in laymans terms, I tried searching it on the web but everything is far to technical for me to understand. Thanks 🙂

Posted on Jul 23, 2011 4:11 PM

33 replies

Alec V.

Level 1

21 points

Sep 22, 2015 2:45 PM in response to losdelrock

I'm also getting a UK Ministry of Defense IP. Creepy... did you ever figure it out?

jalanb

Level 1

8 points

Jan 28, 2016 4:05 AM in response to gen_

Thank you for a most informative and helpful answer.

I can now logically "Allow" LAN traffic and "Deny" WAN traffic. Your explanation was good enough to let me set the rules "Forever" in Little Snitch.

By way of a thank you, here's some witty code: https://github.com/jalanb/what

indasy

Level 1

4 points

May 11, 2016 11:48 AM in response to jalanb

I too am having this issue on several Mac computers in my network. /usr/sbin/netbiosd is sending outgoing connections to 7.80.0.201 which shows up as the Department of Defense Network. Yikes. My OsX firewall is also turned on.

Sophos shows no viruses. I used the terminal commands "nettop" which doesn't help. "nettop -m route" shows an active connection to this source but not where it is coming from. Using Resource Monitor, I sampled the netbiosd process but it didn't yield anything useful. Aside from Little Snitch, I used the program "Private Eye" to monitor programs connecting to the internet, it found nothing.

I have traffic blocked to this IP from my hardware firewall, but this is really bugging me.

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Lion and Netbiosd