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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Using Nmap kicks me out my own network

I am working on a school task, where I have to use Nmap in order to scan for open port on another device on the same network. However, when I use Nmap my network suddenly gets limited. I have tried ...
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Why isn't FTPS, SFTP, or other protocols which use SSL/SSH on port 443/22?

ANSWER ON THE BOTTOM I'm in the process of taking my Security+ exam, and I was taught by the professor teaching me that, when trying to figure out what port to put a protocol on (as there are a LOT ...
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How can all ports be closed? [closed]

I was faced that, there was an hacker attacking my gmail account. With the help of google service, I got the information about that hacker. Again next day he was attacking my pc. When I scanned ...
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What attacks or exploits are possible when MAC address, IP, and Port of a WiFi access point are known? [closed]

I just accepted a position at a small firm and was testing the previous WiFi setup for flaws and exploits that were possible. We have two AP's for business and guest connections, everything checks out ...
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Impossible to make connections through closed ports?

If you have closed all your ports on your internet protocol, you cannot make a connection to that internet protocol. So how do attackers (DoS or any other means that need a connection) make a ...
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VPN blocked ports problem

I use VPN quite often in public places where I don't want anyone to read my web traffic. However, some public places have firewalls that block ports required to establish a VPN connection (I usually ...
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1answer
802 views

Finding the firewall port that filters internet traffic [closed]

In my office, we have static IP's for each system. All the internet traffic from our systems are filtered with a Fortiguard firewall. Is it the default gateway where the firewall is installed? How can ...
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2answers
785 views

can a backdoor executable be used on an occupied port?

Suppose I am doing a penetration test on a network that has a firewall that blocks all ports except 80, 110, and 443. I want to use a metasploit reverse-TCP backdoor executable written in msfpayload ...
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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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1answer
75 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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1answer
55 views

What is an excessive amount of SYN requests for port scanning?

I have a slow internet connection - about 12Mb/s. In 10 minutes I have detected a distributed port scan on the router from different IPs. I have counted these SYN packets at in 600 seconds (10 minutes ...
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ufw and nmap show different result in terms of open ports

I have set my firewall ufw / firewall rules as follows: Default: deny (incoming), allow (outgoing), disabled (routed) To Action From -- ...
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Should I keep incoming data UDP ports open in a minimal server environment?

I have a minimal, uncustomized Ubuntu 16.04 xenial Nginx server environment with only these incoming data TCP ports unfiltered: 22, 80, 443, 9000 When reviewing /etc/csf/csf.conf I found out that ...
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How can I check open ports on android? [closed]

I know that every ISO based network system uses TCP port, and Android is of course not an exception. My question is, can I check the open ports in my device? Can I close them? Is there an app to ...
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Why is it bad to open ports to ip cams? How does a VPN fix this?

I have been running a couple home web cams that I can view when away from home, by opening ports on my router. They are strongly password protected. An IPCam forum that I read says that you should ...
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What ports should I filter on a default Magento installation

I have recently installed a Magento on Ubuntu 14.04 on Digital Ocean and I'm wondering what ports should I filter to keep it safe. Well, actually the question should be: what ports I keep open to the ...
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998 views

What possible attacks might occur on a SQL Server TCP/IP port?

We have a VPS that contains a SQL Server Express instance. Using SQL Server Configuration we have enabled TCP/IP to listen on a random port, say 5741. We have disabled sa and created another user with ...
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Strange devices & open ports on my network

I have performed several Nmap scans on my network to determine what devices are connected and which ports are open. To my surprise I found a very strange device connected(which I do not know ...
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1answer
118 views

server that responds on any port [closed]

I want to make a server that responds open to every port that is scanned by nmap (TCP and UDP). Are there a simple solution to do that?
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803 views

Exposing ports or hide them behind proxy

Are there any security threats when ports are exposed publicly instead of hiding them via proxy? E.g. server application listens on port 8090. We can call this application directly hostname:8090 or ...
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1answer
247 views

How to get any information from 1102,1104,1105,1106 ports?

I have port output from nmap scan below. 1102/tcp open ssl/adobeserver-1? 1104/tcp open ssl/xrl? 1105/tcp open ssl/ftranhc? 1106/tcp open ssl/isoipsigport-1? ...
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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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Opening port 53 on server Risks?

I looked about but couldn't find a similar enough question. I have some remote servers positioned on clients networks, which provide various services (raspberry pi) - and their firewall config is as ...
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275 views

Only HTTP(S) port is open. Why do I need to worry about unpatched software?

Unpatched software poses no risk by themselves. They're only problematic when someone exploits it. How could malware get into my system if I do have unpatched software in general and I'm connected to ...
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133 views

What Mechanisms Keep Network Processes (and Applications) Sandboxed

This question stems from my other question, sorry if it is too similar. Now I would like to know what mechanism is used to sandbox network processes and (if relevant) individual programs, if at all? ...
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Does Nmap requires a closed TCP port to do OS fingerprinting?

I was checking the security of a server by running Nmap. Last time it gives me the following results, indicating that OS could not be fingerprinted: PORT STATE SERVICE VERSION 21/tcp ...
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1answer
506 views

Detecting port scans in OSX kernel

Is it possible to detect port scans on OSX at the kernel level? I would like to write a kext that detects the ip addresses of systems scanning my computers ports. How exactly does a stealth scan work?...
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710 views

Is it possible to scan a remote host in another network if I know a port that is opened?

First of all, this question is not the same as is it possible to test out remote host by using nmap?, because on that question, the questioner is asking for something impossible due to NAT's nature. ...
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1answer
349 views

Open ports on mac. Safe?

My friend is currently running the default firewall on his mac with "Block all incoming connection" (except the basic ones like 80). I just scanned his mac for open ports and I found the following: ...
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1answer
54 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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1answer
55 views

Gradle daemon listens on all interfaces by default

Was messing around with a project today that uses the build tool Gradle and I noticed that by default, it's running a daemon server process that listens on all interfaces. Output of ss below. State ...
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1answer
196 views

Disabled Network Discovery for port 5357 but it still shows up as open in NMap scan

as mentioned in the title I have disabled Network Discovery for all of the 3 profiles yet when I run an NMap scan, the port comes up to be open. I have also run the command netstat -a -b to find the ...
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1answer
109 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 ...
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1answer
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Is there a software that would scan the ports automatically, then predict if there are any malicious activity going on, on my Win10 PC? [closed]

I've got this malware(or spyware as Kaspersky detected), from the USB storage device by purely a lack of focus. After scanning and defecting all the drives that are connected to my computer with ...
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2answers
575 views

Open ports on my NetGear router

I ran an nmap scan on my home router and I am seeing a ton of open ports. Is this normal? How do I go about closing them? $ nmap 192.168.1.1 Starting Nmap 7.70 ( https://nmap.org ) at 2019-03-16 20:...
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1answer
420 views

Replace Nmap with Nessus

I have to replace NMAP with Nessus. I got answer for few settings, but there are few settings in NMAP for which I am not able to get answer. If you could answer me, it would be helpful. For example, ...
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1answer
450 views

Are there open by default ports with Centos 7's firewalld?

My Centos7 firewalld has TCP ports 8083, 8086, and 5000 open. I don't recall opening them, except for maybe 5000 when first learning about firewalld. Are there any ports that might come out of the ...
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2answers
496 views

Open port on my router I never seen before (port 12345)

Today I scanned my router and found out open port 12345, which when googled displays to be NetBus which is potential threat. As a reference I scanned my router many times before for open ports (all ...
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1answer
327 views

How to block an application with iptable which use random port

Scenario: My goal was to allow TeamViewer to connect to my home workstation from my laptop only. So I have tried to bind my laptop's MAC with an IPtables rule as following, [arif@arif:~]$ sudo ...
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1answer
616 views

UPnP Open port on local device?

I ran Zenmap on a local IP address and found that it had one port running UPnP open and the guessed OS was a Windows distribution. Is this normal? Should I be concerned about it? In what ways could it ...
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1answer
1k views

Bypassing closed or filtered ports

I recently setup a basic Ubuntu Server at my home and while at school can't access it because the SSH port (22) has been closed. This lead me open up different ports on my server for SSH so that I ...
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4answers
108 views

Is there any security flaw in using a non root port in production?

I am planning to use a web service running on port 8080 for serving some static files in production . Is it acceptable or is there any possible security flaw in this? NOTE- I don't want this service ...
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2answers
313 views

How to investigate open firewall ports further

I scanned my friend's firewall (Zyxel SBG3500-N) with NMAP and I found some undocumented ports open with services: 8888 tcp open http syn-ack lighttpd 1.4.34 18443 tcp open http syn-ack ...
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978 views

Many Websites, one server, which port to use?

I've recently been doing some research on pentesting websites through metasploit. Now I've run into a problem that I'm sure is pretty common but I cant seem to find anything else about it on ...
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2answers
491 views

Wondering about open port found while using VPN service

I have noticed during port scanning that my "anonymous" IP has an open port (111) while I am using VPN. Does this make me vulnerable as user or is it the provider's failure? Should I change ...
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1answer
918 views

Source port and destination port [closed]

Just fiddling with wireshark and telegram as part of some learning exercise on security. I realised that the source port for the telegram app is 58939 and the destination port would be 443. Why is ...
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1answer
256 views

Web browser initiating connection on non-standard ports. Should it be blocked?

I am doing some egress monitoring on my computer. Once in every few days, I would find some strange connections being logged, which I believe is initiated by the web browser through a related but not ...
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2answers
105 views

Only allow access to specific service running on computer in Demilitarized Zone over internet

If a computer (running different services such as ftp and ssh) is placed on a Demilitarized Zone, will all of its services automatically be accessed by anyone on the internet? If the answer is yes, ...
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1answer
2k views

Netgear WNDR4000 open port 53

Why is port 53 open on the WAN side of the router? And more importantly how do I close it? Port 53 is not one of my forwarded ports. Discovered by doing nmap -pT:1-64 <my-external-IP> -Pn ...
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1answer
530 views

Security risks monitoring JMX

I am doing an internship at a big company wich create industrial automated systems for some big company's. They want me to design a way to monitor all the Java based control modules. Now I am going to ...

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