Questions tagged [ports]

In computer networking a port is a software construct serving as a communications endpoint in a computer's host OS.

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Nmap scan of iPhone public IP address shows port 21 open

I'm using my iPhone personal hotspot to connect to the internet on my computer via usb connection. I don't go through any other router or connection. The phone is my only means of connecting my ...
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1answer
44 views

Open TCP port exploit with MSFConsole [closed]

as a college task I have to exploit a web service that my teacher has set up. But I'm clueless on how to proceed. After I find how to exploit it I have to leave a text message at "the place that ...
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2answers
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What are the advantages of port scanning?

It seems like all the google results to this question answer what port scanning is, but go into little detail about how a pentester or hacker could use the information about what ports a network has ...
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5answers
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What are the best pratices to avoid my server being port scanned

The title probably says it all. I just want to know the best techniques to avoid having a port scanner detecting open ports on my server. I'm using a Linux distro as my OS (Ubuntu Server). Please, don'...
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Can anyone tell me at this platform that what is the difference between filtered ports and blocked ports? [duplicate]

please help me out, I am confused in this.
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1answer
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Is it safe to expose port 22 on a database VM? [closed]

I have seen many answers to this question in different scenarios but I am still unsure of the actual answer. I have a VM in the cloud (Azure), which will be hosting my production database. Is it safe ...
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3answers
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What is the safest way to ssh to a machine behind a router?

I am thinking about forwarding port 22, to 22 on the machine behind router, but is it safe? Anyone can try to connect to my public IP on port 22 and then indefinitely try to guess user and password. ...
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Does having Frontend and Backend on the same port any consequences?

I am currently working on a mean application, with an Angular frontend and an express/node backend. Frontend and backend communicate together with a REST API. When I deploy the application, both the ...
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2answers
569 views

Nmap and it default scripts when I already know some of the information

I am a network guy and not a “hacker” or whatever the official term is these days. I’ve been learning how to use nmap as I think it’s a great tool for just keeping the network secure. The thing is ...
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3answers
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Is there a possible security advantage to using a non standard port for ssl/https?

There are documented (albeit debated) advantages to using a non standard port for SSH. I also read in various places about using a non-standard port for https (e.g. 8443). Is there a possible ...
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Using non standard port numbers [duplicate]

Are there any security benefits to setting up the ports on your firewall to non-standard numbers? For example, using port 15 for the SQL service, or 8443 for https.
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1answer
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Is a connection that uses 0.0.0.0 in Foreign Address, secured?

When I run my application on Centos the specific process opens port that listens for connections from localhost, but uses 0.0.0.0 in Foreign Address. Is it secured? netstat -plunt Active Internet ...
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Nmap scanning with and without proxychains has different behaviour

I'm doing a nmap scan to my own machine to my own machine. First of all I set the port 333 to listen with this command sudo nc -lvnp 333 On the other terminal I run sudo nmap -O -sV -p 0-65535 IP ...
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3answers
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Why does P2P need port forwarding when behind NAT? [closed]

Correct me if I'm wrong, but for a node to participate in peer-to-peer, if it's behind NAT, it must port forward to be able to connect. Why is the port forwarding necessary? I know there are ...
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1answer
159 views

Why can I access the internet with all ports closed on firewall? [closed]

For the heck of it I wanted to see how much I could close down my router from the rest of the internet. I was hoping turning on the firewall, removing any port forwarding and turning off UPnP would ...
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0answers
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Using Windows XP to only read email [duplicate]

Let's settle the obvious: Windows XP is a very obsolete operating system, running it as the main OS on a computer connected to the internet is not a good idea. But, if say, you would like to run it ...
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Very odd traffic - is it legit?

While troubleshooting an unrelated network problem, I noticed an interesting pattern on one of our networks for the last few days (at least). Before crying wolf, I wanted to see if somebody here may ...
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1answer
75 views

Attacking through an open but not listened port [duplicate]

Let us say, we open a port, say port 123, so that upon listening, an application on the server can receive incoming packets through the port 123. If there is no way that an inside application on the ...
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1answer
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Microsoft DS vulnerability?

I heard that Microsoft DS is a port that is commonly used by hackers to hack computers due to its ability to transfer files. How do they transfer files with Microsoft DS? Do they need an exploit to ...
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3answers
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Is TCP Port 80 (HTTP) vulnerable?

I heard hackers' top ports to hack computers through are port 80 and port 443. How do they do this though aren't port 80 and port 443 just for HTTP requests such as GET, POST?
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1answer
257 views

Is it security risk to host CS:GO server on my PC?

I have quite good hardware in my PC and an optic fiber connection. I opened a CS:GO (Counter Strike Global Offensive) server on it, and made it public. The IP for connecting to this server is my ...
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2answers
110 views

Will blocking outgoing traffic from port 80 and only allowing port 443 from my home network lead to more security?

Is blocking outgoing HTTP connections from a home network and only allowing HTTPS connections reasonable? Will it reduce the chances of a man in the middle attack?
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Is it a Bad Idea™ to open all IPv6 ports for devices in an isolated guest network?

At home I have a dual-stack IPv4/IPv6 broadband connection, and I also have a wireless access point. The access point currently bridges all traffic into my LAN, which is not segmented in any way, so ...
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1answer
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Is my server safe from remote hackers if I only allow 1 port and 1 service behind it which only hashs incoming bytes stream & send the hash key back? [duplicate]

I have a python script ,which accepts an incoming connection, reads from the byte stream ,hash it (I'm pretty sure the hash function itself can't be exploited) ,sends the hash key back ,then closes ...
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Is it safe to have an opened port on my PC with a proxy server listening?

I have a single port open for my own proxy server. All other ports are closed. Is it safe for my PC? Even if my port will keep getting bombed by hackers could my PC be exposed to them? There is no ...
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1answer
87 views

How to only display open ports

I'm very new to Nmap. I'm using Nmap to find open ports of an IP by this command: nmap -v -Pn -p 1-100 "$ip" -oG - Here is the output: Host: IP Ports: 6/closed/tcp/unknown 19/closed/tcp/chargen 20/...
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How to secure an open port and public IP address when clients must connect to it [duplicate]

I do not have a lot of experience in networking, however, I have built a live-chat application using socket.io and nodeJS. In order to do this, I had to open a port to allow other networks to connect. ...
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2answers
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Risks of leaving my Redis port open and unsecure?

I left port 6005 open on a server of mine. Currently, if the server goes down, it won't be much of a loss. But my port 6005 is open for Redis queues and I don't necessarily want to have deal with it ...
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1answer
372 views

Why OpenVAS does not find all open ports compared to Nmap?

I recently launched a system discovery scan with OpenVAS to an IP from my net to compare its results to Nmap. As you can see in the image OpenVAS does not find all the ports Nmap does. Both scans ...
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1answer
1k views

What ports should be closed in windows 10?

How can I close ports in windows 10 and what ports are unnecessary to be open? How do I find these open ports to close? Also if I close a specific port on windows 10 do I have to close the outbound ...
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1answer
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Resuming an interrupted nmap scan:

I need to: --resume <filename>: Resume an aborted interrupted scan. But I didn’t: -oN/-oX/-oS/-oG <file>: Output scan in normal, XML, s|<rIpt kIddi3, ...
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1answer
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What's the point of using a firewall to filter ports if they are closed by default? [duplicate]

I'm just learning most of this stuff so bare with me; Using a firewall service such as iptables, is there a point in filtering/blocking a port that is not in use meaning it's closed by default?
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203 views

Security of port forwarding when the target is turned off

I recently set up a server from an old computer case. I use docker to install and use different services on different ports and I would like to access some services from outside of my house. I have a ...
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1answer
74 views

pycharm opening ports [closed]

By running a simple port scan, I have noticed that pycharm is opening three ports on the machines it is installed on. Pycharm is a great tool for developer, but it seems fairly awful to me on the ...
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4answers
5k views

How can I scan open ports without being traced back

I would like to scan open ports of a server. But as far as I know, when I try to scan the open ports with something like nmap in shell they would be able to trace me. Is there a way to secure this ...
0
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1answer
97 views

How to make VPS more secure with UFW?

I have 3 VPS based on Ubuntu 18.04 server OS and would like to open particular ports on each servers. The ports, that I would like to open are: Then let's take a look on the environment: As you ...
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2answers
177 views

Nessus detect more open ports than nmap

I scan my site via namp , I only see 3 ports open. nmap -sV {ip} Starting Nmap 7.80 ( https://nmap.org ) at 2020-01-25 09:42 EST ...
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0answers
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Is there an updated (non-Nmap) top 100 or top 1000 common ports list?

I know Nmap has nmap-services file which gives us the list of top 1000 ports/services found on the Internet. But this list seems to be outdated, as the Nmap top 1000 list doesn't include several ...
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1answer
79 views

Azure publicly exposed resources

Azure's resources are generally made publicly accessible when launched (from a network point-of-view). e.g. An Azure SQL database will be given a public DNS name and the port will be accessible from ...
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Open Ports at ISPs Gateway

I am working to set up OpenVPN access to my home network. To do this, I had to contact my ISP, because they had the necessary port blocked at the Gateway/Router that I do not have access to. In my ...
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2answers
90 views

Security of using DHCP and non-standard ports for medical devices

I recently came across this comment written in a journal article. Lastly, medical apparatus are expected to use Dynamic Host Configuration Protocol (DHCP) for the allocation of their IP ...
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2answers
673 views

Is there practical risk to having UDP ports open?

I understand that everything is potentially an attack vector, but I would like to ask a practical question about UDP ports Suppose you're pentesting some small organisation and you found a couple of ...
0
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1answer
147 views

Visual Studio Code leaving port open

Running a port scan via Network Utility on OS X 10.14.5, turns up two different outcomes, depending on whether or not I have Visual Studio Code (1.35.1) open. If the application is open, I'll get ...
2
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1answer
92 views

Can a VPN provider or actors within its infrastructure access open ports on the client machine?

From my understanding of a VPN, it essentially creates a network between the two 'machines'. So if I have open ports (e.g. HTTP, SSH) on my client machine, those can be accessed by the VPN provider or ...
3
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1answer
341 views

Nmap giving different result between Mac OS scan and Linux (Kali) scan [closed]

I try to do a simple TCP scan on an Kubunt VM (is on VirtualBox), from two different OS. From the Host (Mac OS system) and from a Kali Linux VM (tried VirtualBox and Parallels also). Kali Linux (...
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2answers
264 views

How to Defend Against Port Scan Attacks

I was told that Hackers scan for open ports in random IPs and if they are open they hack the computer. What open ports can be hacked? How do I close the ports?
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1answer
109 views

Why should I use firewall to block ports with no running services? [duplicate]

A firewall is for blocking / limiting access to specific service / port. I know that it can be useful for allowing only certain IPs to a port (for example I don't want to have SSH open for the whole ...
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0answers
46 views

WMI Performance Adapter function for Chrome browser?

Does someone know why the WMI Performance Adapter (WmiApSrv.exe) always starts when launching Chrome browser? Whats the function of this service? I have heared this service can be maliciously used to ...
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2answers
687 views

What ports are okay to be open on a macbook pro?

When I do a network scan for open ports on my MacBook Pro, I can see the following open TCP ports below. Are these 'standard' open port for a personal computer of this type? Should I be concerned? ...
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0answers
970 views

Nmap Shows all ports are closed [closed]

I am facing a problem with Nmap while scanning metasploitable. I am using two different PCs. One with Kali Linux by using USB boot and on other PC using Metasploitable running on VMWare. I have ...

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