Will my mobile phone work on board the ferry?

Background

What inbound ports do I need to open on my firewall for SBS 2011 Standard?
Go to command prompt and enable telnet services, syntax, telnet ipadress port number. USB disconnect, device number 4 [ Inbound or Start - Type in the port number here. The main reason you interject a firewall between the Internet and your system is to get in the way of outsiders trying to access open ports. Open Source New to Open Source? Notify me of follow-up comments by email. Thanks for this information.

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Port Scanners

Also good to know! KennyYounger rpcinfo is a useful too. If this answered your question, don't forget to mark it as the answer for the benefit of future viewers.

You need mountd open when you first mount the filesystem. It runs on a dynamic port, so it won't always be the same. I put a link to a guide in my answer. Critical info for this process. I upvoted your answer! We really do prefer content, not pointers to content.

Not sure about but the recommendation in links seems to be grossly outdated. TL;DR - need to allow both nfs ports , and mountd port after fixing it.

You don't need to restart the entire box. A simple sudo service nfs-config restart before restarting the nfs-kernel-server will do just fine. This will give a list of all ports used by all NFS-related program: I hope this helps someone. Erdem KAYA 11 1. It might help to explain why you needed port and how you determined that. Frankly, I don't have a clue why I needed to add a permission for , but adding that solved my problem.

I just wanted to share if that can save time someone else in the future. I am sorry for not being able to answer the question. Sign up or log in Sign up using Google. What in the world are all those ports used for? But here's a key concept: In fact, if you and I agree to use for HTTP traffic in either direction, and configure our systems to follow that convention, it will work.

Which is where the fun begins for all those evil hackers as they cackle maliciously, wash their hands in the air, and contemplate breaking your system. Ports exist either in allow open mode, or deny closed; blocked mode. If your mail server is in a state of readiness to receive SMTP traffic, we call that "listening on port The main reason you interject a firewall between the Internet and your system is to get in the way of outsiders trying to access open ports.

The applications on your network's machines can open ports without waiting for your knowledge or permission. Some, like peer-to-peer file sharing or video conferencing software, open ports with the single-minded obsession of a frenzied border collie.

Each of those open ports becomes another potential hole in your security, gullibly accepting whatever is sent to it, unless you take proactive steps to block it. Now, back to the evil hackers. They count on you being clueless about ports. Hoping you've left something "listening," they experimentally send code to your network addressed to ports you never thought of such as port , because in the dyslexic nomenclature of script kiddies, the numbers look like ElEET -- as in, "elite" hacker.

So here's the point of this entire article: Your goal is to block every port you can. Managing your firewall largely means playing around with ports and services, blocking whole ranges of ports -- everything that your business does not require open.

Although the default stance of the Firebox is to deny everything, since the day it was installed at your office, someone has opened it -- that is, instructed it to allow network traffic through to certain ports on certain machines in your network. Was the firewall opened selectively and carefully? Or did someone mumble, "I don't have time for this," and create rules so the firewall permits everything, from anywhere, to anywhere? If so, you don't really have a firewall. You have an expensive red paperweight.

Ports are a foundational building block of the Internet, and thus, of Internet security. Have fun researching them. The more you learn, the smarter your firewall configuration will become.

With a little practice, you'll get it looking less like Swiss cheese, and more like the steel barrier "firewall" implies. WatchGuard has deployed nearly a million integrated, multi-function threat management appliances worldwide. Our signature red boxes are architected to be the industry's smartest, fastest, and meanest security devices with every scanning engine running at full throttle.

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Locate a Training Center. Log In Contact Us. What Is a Port? The Quick and Dirty about Ports Since the whole Internet comes to your system over one big wire, how does your network distinguish streaming video from a Web page, and an email from a sound file?

The five most commonly-used Internet services are:

Method 1. Recommended and safe.