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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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52 views

Nmap Shows all ports are 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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3answers
89 views

Hackers open ports protection

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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37 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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29 views

Is it normal that the service WMI Performance Adapter always starts when launching Chrome browser? Whats the reason

Is it normal that the service WMI Performance Adapter (WmiApSrv.exe) always starts when launching Chrome browser? Whats the reason? I have heared this service can be maliciously used to "communicate" ...
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2answers
68 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, can this be accessed by the VPN provider or ...
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1answer
400 views

Does blocking all ports make a machine more secure?

I have a machine that I use only to browse the Internet. What if I blocked all ports on this machine (inbound and outbound) except for port 80 and port 443, and restricted these two ports to an ...
2
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1answer
58 views

Access Control Lists - Why block a port rather than block a protocol?

I am studying for my Security + exam. I have just learned that ACLs can be designed to block ports and/or entire protocols. The book I am reading states an example: "if you want to block HTTP traffic,...
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1answer
73 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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0answers
49 views

Inbound rules for a port is configured and disabled yet an NMap scan shows that the port is opened

I am new to Windows Defender but have read about it to understand the basics of Inbound/Outbound rules. As mentioned on the app, Inbound connections that do not match a rule are simply blocked. For ...
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1answer
322 views

My router is getting port scan attacks [duplicate]

My internet suddenly cut out yesterday, i checked the router and it looked like nothing is wrong. I looked at the logs and i see this 2019-08-18 12:50:39 Security Warning Detect UDP port scan ...
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1answer
146 views

Why is it okay to run NGiNX or Apache Web Server as root on port 80/443 and not your app directly?

Just like the title says, I would like to understand: what are the implications of running a custom app (like node or flask) on port 80/443. Is running a reverse proxy like Nginx mandatory from a ...
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1answer
79 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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2answers
151 views

How to perform a security test/review/penetration testing of Ethernet ports?

I have been engaged by a client who wants its Ethernet ports checked to determine whether port security is functioning effectively. What can be the approach or steps to do check Ethernet port ...
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0answers
83 views

Compute Engine (Google Cloud) is hacked through remote terminal with port 9090 [closed]

I'm using Compute Engine on GCP. I installed ubuntu + apache (including ModSecurity). We used third party to do penetration testing and they can successfully doing remote connection through port 9090 ...
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0answers
74 views

nmap gives different results in two shells on the same computer

I'm running kali and metasploitable2 in Virtualbox, and have them connected via the host-only networking mode. I can ping and ssh from kali to metasploitable, and have assigned the following IP ...
33
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1answer
7k views

I have found ports on my Samsung smart tv running a display service. What can I do with it? [closed]

I have a Samsung Smart TV running Tizen OS, and out of curiosity I scanned it with Nmap. I found multiple open ports. One of those ports is running a "display" service. Does this mean it can cast its ...
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0answers
37 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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3answers
282 views

2 vs 3 tier network architecture

I am interested in how a 3-tier network topology (web/app/data) provides improved security than a 2-tier topology (web-app/data). I understand the concept of a DMZ as the initial contact point with ...
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1answer
80 views

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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1answer
122 views

How to find out which application runs behind port 31337?

I found an open port on a "Kartina Quattro" (https://www.kartina.tv/article/247-kartina-quattro). It's a device for watching russian TV channels. The port number is 31337 and the Service is called ...
3
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1answer
884 views

Ports Showing Closed/Filtered in Nmap Scans

hopefully this isn't a stupid question.. I am running some nmap scans and I get a list of ports that show closed. Why would they even show in the scan report? Can these be exploited further with other ...
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1answer
124 views

Detecting port scanning activity of a mobile app

I highly suspect that one of my iPhone apps is scanning for open ports on the local network, but can't think of a way to detect such activity. I know that I can monitor http(s) connections by using ...
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2answers
365 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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0answers
28 views

Nmap showing different open ports every few seconds [duplicate]

I'm running Nmap on an Amazon Web Services EC2 instance but between runs just a couple seconds apart, I'm getting new results. Is this normal? I'm seeing open ports then they don't show. I'm running ...
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2answers
498 views

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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1answer
138 views

Determine victim of port scan's OS

I am taking part in a practice sandbox, and have a pcap file in Wireshark: with the traffic depicting a Vertical Port Scan. Is there anyway to find out the "victim"'s Operating System? The packets are ...
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2answers
171 views

Do I lose the anonymity of a VPN if they open a port for me?

I currently use a VPN supplier that does not allow for opening ports. They argue that I lose the whole point of a VPN and the anonymity by doing this. I can't see how and they don't seem to be able to ...
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1answer
440 views

TCP Scans vs SYN Scans in port scanning

What is the difference between TCP Scans and SYN Scans?
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1answer
51 views

Finding how many filtered ports of a host that would be listed as “filtered” on Nmap

I just started working on nmap and was confused by this question. I'm unsure if I understood it correctly, so I appreciate your help with this. Using Nmap, find how many ports are filtered in testphp....
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1answer
219 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? ...
4
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2answers
409 views

Is is bad practice to use non-standard ports? (for example ssh from 22 to something different)

Background is that I am learning some technical stuff with the Enki App. In this case about security. The App states that it is a misuse of a port if I change for example the ssh port from 22 to ...
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2answers
210 views

Should ports be visible to nmap?

I'm currently working on the firewall when I discovered that the firewall exposes a lot of ports outside of the internal network. I discovered this when setting up a new FTP server using a basic nmap ...
2
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1answer
229 views

Is it safe to have port 443 unprotected by firewall without application?

Say I have a website, http://www.mostlysecuresite.com, which runs on a server at my house. Let's say I wanted to get an SSL cert in a few weeks. Because of this, I had my Port 443 forwarded on my ...
46
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5answers
15k views

Should I close port 80 forever and ever since the 2018 Google-indicated web-security initiatives?

I often establish Ubuntu-LAMP environments on which I host a few Drupal web applications that I myself own (I don't provide any hosting services and never done so in the past). Whenever I establish ...
1
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2answers
162 views

Port bound TLS certificates? (1 Self-signed & 1 CA)

For my android game, I want to secure the connection between the server and its clients through TLS certificates on each side, because of the sensitive data that is beeing exchanged through a token ...
1
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1answer
319 views

Understanding port scanning with firewall enabled

My objective is to do a port scanner in windows and find the ports which are open. Suppose, I run an application which opens up a port 8000. Now I create a new inbound rule to block all incoming ...
1
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2answers
547 views

Do I have to block UDP ports when I launch my own server with a public IP?

I am trying to give better security to my Raspberry sever. When I installed UFW, I allowed just port 80/tcp and my own high port for SSH communication, and by default are all others ports "deny". ...
1
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1answer
28 views

Why do processes on servers have socket types associated to the port number? [closed]

Why do some servers have TCP/UDP alongside the port they're listening to. To my understanding TCP and UDP are socket layers, they're methods of determining how the traffic is being sent over the ...
1
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1answer
375 views

NMAP reporting all ports open

I'm trying to scan my targets for open ports. However, NMAP reports all of them as 'open'. I know there's a firewall in between. I tried the SYN scan, and when I check the traffic in WireShark I see ...
1
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3answers
333 views

Nmap scanning single port too fast? Shows as filtered?

I ran into an issue when trying to scan a single port on a single machine. I ran a range scan to find machines with port 25 open. Then I just arbitrarily chose one to work on. I scan that machine with ...
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1answer
89 views

Port knocking is authentication?

In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of ...
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1answer
54 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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1answer
490 views

Why adclick.g.doubleclick.net listens on all ports [closed]

I have adclick.g.doubleclick.net listening on all ports. When I launch an application like Starcraft 2, for example, it is listening on localhost. Or for some applications, there was a connection from ...
1
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1answer
802 views

What are the possible solution for blocking VPN connection on a home network?

I am not a techie. I am just wanting to force some parentral control using OPENDNS. Opendns works fine however it is easily broken on android or windows using vpn software like ultrasurf or latern or ...
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2answers
48 views

Is there a point to set up passwords for services like MySQL, Redis etc. if we disable their related ports?

Redis' default port is 6379 and MySQL's default port is 3306. Let's say we disable these ports to outside of the world with ufw. And let's say only I have access to the servers. Is there still a point ...
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1answer
192 views

What ports can make me get RCE on the devices? [closed]

I know that remote code execution depends on the service running on the open port. For example I know that SSH, FTP may be vulnerable to RCE if they are running an unpatched version. So what about ...
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1answer
104 views

Does Windows perform TCP and/or UDP port scans? [closed]

I want to know whether Windows Operating System does TCP/UDP port scans, and how often if it does? Thanks for your time.
1
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1answer
86 views

Refusal to 'open' up corporate network?

I am working a project which requires access to a service running on a remote server, over a single TCP port (>1024). This service runs on a machine located within an existing network, and the project ...
2
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2answers
11k views

Can a hacker hack into port 80?

We normally say port 80 is firewall friendly. But can a hacker just hack into port 80 via TCP or UDP? Or is Port 80 by default not always open? It waits for the host to initiate a connection via ...
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3answers
3k views

Port sweep vs port scan

I was asked this question in an interview: "What is a port sweep?" When I replied with port scan he said that my answer was not a scan, it was a port sweep. I googled and found "tcp sweep: but not "...