Questions tagged [ports]

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

Filter by
Sorted by
Tagged with
1
vote
1answer
766 views

NMAP not reporting open ports with -sS scan

Is there any reason why an -sS scan (or most others) would not report an open port that doesn't have a service attached to it? For example, in a regular -sS scan, the following port will be missing, ...
1
vote
2answers
4k views

How to check if a port can be accessed from the outside

I want to be sure that the firewall protecting the intranet is effectively rejecting/granting access to a port. I have no access to the firewall nor any other external machine. Is that possible at ...
1
vote
2answers
82 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 ...
1
vote
3answers
1k views

Is Open Port 25 on Web Server dangerous?

Port 25 of a web server is open. We dont have any email server, since we use google mail server, but still port 25 is open. Is it dangerous to keep it open? If it can be attacked then how it can be ...
1
vote
2answers
768 views

Why does nmap remotely show when I have port 6969 open, but not others?

Specifically, I was running a node.js application on port 6969 which I thought was strictly local. I discovered this was not the case when I ran nmap <myip> from a different computer and found ...
1
vote
1answer
836 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 ...
1
vote
2answers
766 views

Close Port 587 - Ramifications?

Our recent PCI scan failed because "Plaintext authentication is allowed over unencrypted channel on SMTP." As such, our tech support suggested to close port 587. What are the effects of closing port ...
1
vote
2answers
342 views

How can a computer found on traceroute show all ports closed?

I ran a traceroute on a website I'm connecting to and got the following output: 1 skyrouter (192.168.0.1) 3.989 ms 1.389 ms 1.916 ms 2 * * * 3 be397.pr2.thlon.isp.sky.com (2.120.11.8) 31.564 ...
1
vote
1answer
156 views

What security issues are there with remote access for firewalls, routers, etc.?

I am currently looking into cybersecurity for small businesses and it is something I have become very interested in. One of the questions in the questionnaire is: Confirm that any remote ...
1
vote
1answer
2k views

Why is my Windows 10 machine listening for 127.127.127.127:3939?

I was hoping someone out there could answer why my Windows 10 Machine would be listening on port 3939 using 127.127.127.127 over TCP? I get the below with netstat -nat: TCP 127.127.127.127:3939 ...
1
vote
3answers
8k views

Why P2P need portforwarding when behind NAT? [closed]

Correct me if I'm wrong, but for a node to participate in peer-to-peer, if it's behind a NAT, it most port forward to be able to connect. Why is the port forwarding necessary? I know there's ...
1
vote
2answers
1k views

Spike in TCP port 5904 activity - what for?

There is an 'Internet Weather Report' on the Threat!Traq video blog by AT&T security researchers. In the March 14th broadcast, at around 31 minutes in, they mention an increase of scanning ...
1
vote
1answer
437 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
vote
1answer
87 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 ...
1
vote
1answer
306 views

Potential intrusion on home network?

I was browsing through my home network linksys router logs today and noticed an incoming connection from 41.212.36.114 to port 44543. I checked out this IP address at it's coming from Kenya. I'm in ...
1
vote
2answers
563 views

REJECT Nikto Scans With Snort Rules

Hoping someone on here knows a way to reject Nikto traffic with Snort rules. I've been having zero luck for days finding this anywhere online. Thanks. Peace.
1
vote
2answers
1k views

Port-Forwarding insecure? [closed]

I was going to do port-forwarding to create a gaming server with an old PC. I the found out that it makes more things visible to the internet. Is port-forwarding a bad choice considering its ...
1
vote
3answers
906 views

Spytechphone - iPhone

When port scanning my iPhone I get an RST, ACK from 'Spytechphone' over port 8192, does anyone know what this port does? I can't find any useful information. [1] http://www.iana.org/assignments/...
1
vote
3answers
1k views

MySQL 3306 open port security

I know that having the MySQL 3306 port is unsafe even if you restrict the user access based on IP. But what if you really need remote access to your database ? Maybe two applications reading and ...
1
vote
2answers
1k views

OSSEC, what is it telling me about port changes?

I've been diving into OSSEC for the last couple of months, but I feel unclear on one of it's alerts. I've provided the alert below. The main difference I see in previous output and current output is ...
1
vote
1answer
5k views

MAC-address restricted port forwarding

I have an ASUS RT-AC68U router and would like to set up port forwarding, but I would like to restrict which MAC addresses can connect through that port. My use case is that I'll have a live camera, ...
1
vote
3answers
645 views

Is forwarding a port(s) a security risk to all computers on the network or just one?

I know forwarding ports can add some security risk, but if I forward a port to a computer, say running linux, would it add a security risk to all computers on my network or just the one?
1
vote
1answer
203 views

Hardening Services, Ports on OSX

People boast about OSX Security, yet I find it very hard to find a comprehensive manual in regards to any equivalent Services and the ports they use. I am aware of lanchd and launchctl and Lingon is ...
1
vote
3answers
2k views

How can i reject connection from LAN and WAN to some ports?

Scanning with nmap, I discovered that there are 3 open ports on my server. I want to deny any access to these ports from any machine, regardless of whether it is on the same LAN or via WAN. How do I ...
1
vote
2answers
6k views

When can closing port 80 be a problem?

Since port 80 is typically used for HTTP must a web server have it open or otherwise configure links to specify a different port (e.g. http://www.example.com:8080/mypage.html)? For example this site ...
1
vote
1answer
158 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 ...
1
vote
2answers
316 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? ...
1
vote
2answers
578 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
vote
1answer
49 views

Port filtering for Ubuntu-Nginx minimal server environment

I've established a minimal, uncustomized LEMP stack (Ubuntu 16.04). The only server I have besides Nginx is Postfix. To protect that environment I filtered all ports besides a few, this way: ufw ...
1
vote
3answers
3k views

How to chose a port to run an application on localhost? [closed]

I'm considering developing a web application for my own usage on desktop, running on localhost, automatically launched at startup. I'll need to chose a port to do so. What I'm uneasy about is the ...
1
vote
2answers
4k views

Why TCP port 6666 and port 7777 open in a LTE router?

I've got a LTE wifi router(JioFi 2) and there's port 6666 and 7777 are open. Nmap scan result, PORT STATE SERVICE 53/tcp open domain 80/tcp open http 6666/tcp open irc 7777/tcp open cbt ...
1
vote
1answer
582 views

Running HTTPS service on port 443 [closed]

According to the Alexa Skills Documentation, I will get an unexpected communication issue if The endpoint is not configured to accept traffic over port 443. I'm trying to do this with my home router....
1
vote
2answers
421 views

Tool to listen http traffic goes to different ports (Windows) [closed]

I am using a set of microservices (Spring MVC Hosted in Undertow containers along with Gradle) which are spawned on different ports in the same machine. Services make HTTP REST to each other. I need ...
1
vote
1answer
565 views

Is there anyway to probe open out ports?

I can use nmap to find open ports on a specific client with following command: nmap -sC -sV [IP] This command only shows incoming open ports, I'm looking for a similar command to find outgoing ...
1
vote
1answer
226 views

Port forwarding with VPN

EDIT: My VPN has port forwarded a 5-digit tcp/udp port for me. What kind of attacks am I opening the computer to with VPN port forwarding?
1
vote
2answers
956 views

Nmap stealth scan shows that port is filtered

The title is really bad, but I was able to find better. I have installed Debian on VMware, and set iptables to block any traffic except port 80 (inbound and outbound). When I run a nmap scan it shows ...
1
vote
3answers
3k views

Creating port-specific SSH authentication for the same user

I have a Linux server running SSHD and would like to know if its possible to configure it, such that from within the LAN you only need a RSA key to authenticate (on port X), but from outside the LAN ...
1
vote
1answer
1k views

Outbound Port 443 Open but Not Allowing SSH [closed]

My college wireless network has a firewall blocking all outbound ports except 443 and 80. The wired network, however, has none of these restrictions. I can connect to HTTPS sites (obviously). On my ...
1
vote
1answer
373 views

Understanding a Zenmap output

I'm running Zenmap on my Windows 7 laptop. I ran an intense scan with UDP targeting my router 192.168.1.1.I realize that I'm probing into the back end of the router from the inside and that any open ...
1
vote
1answer
4k views

Vulnerability by leaving an open port in a pc

I have the following set-up. Home pc ---reverse ssh tunnel---> to linux server The reverse ssh tunnel is set-up so that on my home pc, port 22 is open, but I have nothing currently listening on that ...
1
vote
1answer
144 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 ...
1
vote
1answer
370 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
vote
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
vote
2answers
49 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 ...
1
vote
1answer
53 views

Opened port leads to a collection listing

I've been doing some searching on a macOS server and have noticed that there's an open port that I am able to access outside the network. When I go to this port it will ask for a username and a ...
1
vote
1answer
133 views

Security of a Unity 2017 Cache Server

I am currently running a cache server on an ubuntu machine on our local network for an upcoming game. We have several off-site members of our team who would like to make use of the cache server too. ...
1
vote
2answers
1k views

NMap scan from within armitage - missing root privileges

I just installed metasploit + armitage on my Ubuntu 16.04 machine. When I start armitage and click "Hosts->Nmap->Quick Scan (OSdetect)" I get the following error: msf > db_nmap --min-hostgroup 96 -...
1
vote
1answer
420 views

have opened HTTPS port but still no response [closed]

I have watchguard firewall and server behind it configured with NAT. I was told to open port https for 1 of the server. I have create a rule from any to the NAT server to allow port 443, the ...
1
vote
1answer
3k views

Nmap “adjust_timeouts2” error

Just tried a port scan against a cloudflare protected website: nmap -sV --version-intensity 9 --top-ports 2500 -v --script banner --data-length 0 -n <ip address here> -Pn -T2 -sT I get a lot ...
1
vote
2answers
716 views

Port forwarding and port blocking security concerns

I am highly concerned about RDP security and about multiple occasions of ransomware infections through RDP, so now I am inspecting possibilities for self-defense against these threats. What interests ...