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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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
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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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189 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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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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204 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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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
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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
544 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
606 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
607 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
356 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
621 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
2k 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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2answers
347 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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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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587 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
927 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
264 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
106 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
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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
587 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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2answers
187 views

Can I communicate with a wireless device, without logging in the same LAN?

Suppose there are three devices: WPA2 protected AP linux laptop, accessing internet through tha AP linux laptop, not connected to the AP I own the third device and do not know the AP's password. I ...
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1answer
2k views

In-office Flask app on port 80 - is it safe? [closed]

The title says it all; I'm just serving data to coworkers as a courtesy via a series of single-page apps that I basically consolidated under Flask, serving Jinja templates. Presently, I have Apache ...
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2answers
3k views

Vulnerability of the open port

I'm installing service on the cloud machine and I was wondering on port vulnerabilities for my customers. My service which lives on server A (often on a customer site) needs to access server B (...
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What are the ports used by Online Email Accounts such as Yahoo Mail, Gmail, etc.?

Let us say that I send an email using Yahoo Mail or GMail. Can this email be intercepted using a packet sniffer? On which port does the email travel? HTTP, SMTP, POP3?
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Security implications of forwarding ports 1-10000 on Airport Express?

Today I found that ports 1-10000 were being forwarded on an Airport Express that I as well as a fair number of other people share. This was setup by another user. There are multiple machines and ...
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1answer
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how is my router being modified to include WAN port-binding items for Teredo and Spotify [closed]

My router's configuration app (browser-interface) has a page for Virtual Server. It has entries I did not create, at least not intentionally using the interface, for Teredo, Skype, Spotify, uTorrent. ...
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1answer
4k views

Telnet local privilege escalation exploits possible even when telnet is running under a normal user account?

http://www.exploit-db.com/exploits/8055/ says: The telnet protocol allows to pass environment variables inside the telnet traffic and assign them to the other side of the tcp connection. The ...
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Openvpn blocks external traffic [migrated]

I am looking to set up self-hosted cloud storage, and need to open a port in order to do this. This would be hosted on a raspberry pi with an external drive that I used to store my important documents....
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59 views

How to install and use scanlogd [migrated]

I want to install and run scanlogd from my Ubuntu 16.04 machine. I am able to install and run it with apt-get install scanlogd and it works fine. But I am not able to change the parameters like log ...
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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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0answers
84 views

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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0answers
80 views

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
46 views

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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35 views

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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1answer
73 views

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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88 views

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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1answer
7k 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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2answers
1k 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
355 views

How to ensure if an SSH tunnling failed (if I haven't really tunneled)

I tunneled data transition as 22-22 and 2222-80, between my PC and VPS: ssh user@1.1.1.1 -L 22:localhost:22 -L 2222:localhost:80 -i ~/.ssh/key To make sure both tunnels were created, I executed lsof ...
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2answers
596 views

Windows 10: telnet - Openwall GNU/*/Linux telnetd running on an open port normal?

I noticed my internet connection was acting a little strange (stuttering up abruptly seemingly randomly), so I thought I'd see what's using it using Zenmap. I ran "Intense scan" using the latest ...
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0answers
43 views

Firewall issues

Background I have an Android device (Minix M5) that I handed to a customer The device only does outbound connections, so no inbound traffic The customer confirmed that s/he opened up the ports ...
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1answer
1k views

Why is Parallels Plesk running on port 8443 > 1023?

Parallels Plesk, a server administration software package, uses HTTP(S) on port 8443 (ref). I know that ports <1024 are only available for root. This means that if the server Plesk is using for ...
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1answer
1k views

Are these port secured on my AP?

I'm doing a project for my high-school and I'm trying to get the best security for my network. I've made almost everything in my access-point configuration and I have only 3 tcp/ports open on my AP: ...
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1answer
778 views

How to turn of telnet and FTP on Thomson 789vn router? [closed]

I have run a port scan against a Thomson 789vn router and have noticed to my surprise that its HTTP as well as telnet and FTP ports are open. How can one turn off telnet (also FTP) using the router's ...
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1answer
48 views
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1answer
53 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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2answers
466 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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3answers
3k views

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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TCP Scans vs SYN Scans in port scanning

What is the difference between TCP Scans and SYN Scans?

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