A port provides a location for an application to interface with the network. If there is no application that is listening at a particular point, data sent there will never be used.

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4
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4answers
18k views

Windows 7 is blocking ports

I am trying to open port 80 and 3690 for HTTP and svnserve respectively (inbound for both). I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. ...
-3
votes
1answer
822 views

How do I port forward on a Home Station Fibra òptica Amper EG-663 Amper router?

I cant find where port forwarding is in this one. I know how to open ports on my other routers. Model: Home Station Fibra òptica Amper EG-663 Amper
2
votes
3answers
4k views

iptables firewall only allows internet traffic if source port of 80 is allowed

I am configuring an iptables firewall, currently just to allow http and https traffic. It is working but under a particularly strange rule - I must allow incoming connections with a source port of 80....
0
votes
0answers
18 views

ASUS RT-N66R won't allow port forwarding of 80

Has anyone else tried to port forward outside port 80 to inside port 80 on an ASUS RT-N66R? I just spent 3 hours trying to get a new web server functioning from the internet (which I've done quite a ...
0
votes
1answer
32 views

How to create a subdomain pointing to a different port number?

In my use case I would like to create a sub domain with the main domain's IP address but with different port number. For example: I have the the main domain as abc.com pointing to 192.168.1.1 @ ...
0
votes
1answer
16 views

VPN and local Apache port forwarding

I have the following configuration, Apache Web host that is running on my local PC at port 4444. I've registered at noip.com for DDNS, and I've done setup correctly. Was wondering, since I am ...
0
votes
2answers
31 views

Using nmap to traceroute on a specific port

The short version of this is that from client A to server B, some connections are getting all the way there, and others are being dropped in transit. I know they're being dropped in transit because, ...
0
votes
0answers
5 views

Windows Server: Ports that a normal user cannot bind to

I have a server application that wants to bind to port 1841 on my Windows Server 2012 and, when run as a normal user, seems to fail at that point. I remember that some port ranges could not be bound ...
111
votes
3answers
230k views

What are CLOSE_WAIT and TIME_WAIT states?

When I do netstat -a on my Windows machine, I get a listing of the ports with one of the four states: LISTENING CLOSE_WAIT TIME_WAIT ESTABLISHED What do CLOSE_WAIT and TIME_WAIT mean/indicate?
0
votes
1answer
23 views

receive data from buffer in socket programming

please see this picture. recvfrom() blocks until a datagram is received from a client. Since there is no connection,each datagram may come from a different sender. i can receive data form receiver ...
0
votes
1answer
32 views

MySQL Port 3306 on VPS not visible from remote

Newbie here, migrating my site from a shared host to a name-based virtual host on a new virtual private server (Linode) running Ubuntu 16.04. Apache is working. I have installed MySQL and created an ...
2
votes
4answers
650 views

Understanding unique ip and port [duplicate]

My browser is Firefox, with 3 open tabs: tab1-->google.com tab2-->yahoo.com tab3-->msn.com All of them use port 80, and so does Photoshop: How does computer know which data belong to ...
3
votes
1answer
16k views

socket.error: [Errno 10013] Port forbidden access permissions

When trying to use a Python script I get this error: socket.error: [Errno 10013] An attempt was made to access a socket in a way forbidden by its access permissions I put the post on ...
-1
votes
0answers
16 views

Serial port info in Ubuntu

my first post. This is the actual code: int Open( //Serial port name. const char* pPortName, //Is IEC or DLMS used as starting protocol. bool IEC, //Maximum ...
7
votes
4answers
10k views

Open port 5672/tcp for access to RabbitMQ on Mac

I have RabbitMQ in its latest version installed on my Mac with default configuration and when I'm accessing it from localhost there's no issue what so ever. But today I build a linux machine on local ...
0
votes
1answer
37 views

Intermittent Port Open/Close

I'm experiencing intermittent port opening issues. I have a server which uses TCP running on port 8080 in CentOS 6. iptables is disabled and port 8080 shows it is LISTENING for traffic. Here is a ...
8
votes
1answer
10k views

Why is “nc -l xxxx” not opening a port?

I'm trying to get netcat to listen on port 4444, but it doesn't seem to be working. I am checking to see if the port is open using nmap, but it doesn't pick it up and I can't figure out why. I have ...
0
votes
1answer
6k views

How to open a port for all users: NSA 2400

I'm trying to open up port 8332 for all users behind my firewall but can only find instructions for doing so for a single IP address. How do I make sure all my users can use a specific port? I've ...
0
votes
1answer
16 views

Port 5588 Connection Refused

Before I make this, please note that I have searched and found no answer to why this is happening. So do not mark this as a duplicate as that's invalid. For some reason when I go to http://...
1
vote
1answer
25 views

How to use ethereal to determine what port to open?

Let's say I closed all the ports with iptables and I start a new app like a browser, mumble or any program. Is there a way for me to see with ethereal what ports this application is trying to ...
5
votes
3answers
9k views

Cannot connect to guest OS from host OS

I have installed OpenSUSE on VMWare player as guest OS and my host OS is Windows XP. What I want to achieve is to send message from my host (i.e XP), say on port 7000 and receive it on a specific port ...
0
votes
1answer
25 views

Why does SoftEther VPN listen to random ports? How do I make it stop?

I have SoftEther VPN running on a Linux server with SSTP, L2TP over IPSec, VPN over DNS, and VPN over ICMP enabled, along with management via TCP port 5555. I have disabled everything else I could ...
0
votes
2answers
59 views

Iptables - Remove filtered ports and close them

Here's the result of nmap command on my dedicated server from my home linux pc : Not shown: 980 closed ports PORT STATE SERVICE 20/tcp filtered ftp-data 21/tcp filtered ftp 22/tcp ...
1
vote
0answers
93 views

If nmap reports a port is open, does that ALSO mean a service is listening on the port?

I have a Thompson TG585v7 router/firewall whose firewall is configured to FORWARD several ports to a computer X54 within the LAN. These ports are in the range 1024 through to 2500 That X54 ...
0
votes
0answers
30 views

Why doesn't nmap show SIP ports open for this router?

SIP calls on from demo_bob to demo_alice on Asterisk had no sound, so I opened ports on the NetGear WNR1000v2 - N150 Wireless Router: # Service Type Port IP 1 IP_Phone 6670-6670 192....
2
votes
2answers
14k views

Can't access my IP camera over the internet

EDIT: My problem is solved, please read comments 2-5 and 8,9. I have an EasyN F3 (F3-M166) IP camera. It works fine on local IP address, but I can't access it over internet. This is what I have done ...
0
votes
0answers
16 views

AWS Bitnami Tomcat Stack: Connection refused on :8080

I installed KIE Server and Drools Workbench following this tutorial on an AWS EC2 instance based on a ready to use Apache Tomcat stack by Bitnami. The installation went well and so I'm able to start ...
0
votes
1answer
5k views

Firewall open ports for vSphere

I need to open ports on a firewall, so that a client could access his VM console through vCenter server's Web Client. I had a look at this page about port description, but I am a little confused. I ...
1
vote
2answers
685 views

Unable to open port on Win7 machine

I'm trying to run Privoxy as a proxy on my machine. I want the browser on my Android device to access the internet through it. Now I've opened exceptions for both Privoxy and port 8118 (which is the ...
14
votes
8answers
41k views

Utility to open TCP port to listen state

Is there some basic utility to open a specific network TCP port on my machine? I need to test how my program deals with ports on listening state..
-2
votes
3answers
56 views

why is my processes in task manager showing ports like 100028,103904 etc ? I know only 65535 are possible in any windows system

I am on W10 x64. This is unusual . I haven't seen port number that high .I know only 65535 are possible in any windows system. it is happening from today ( I have rebooted several times). Is it ...
-1
votes
1answer
26 views

What are the basic commands for ufw firewall in Ubuntu?

I want to setup ufw firewall in ubuntu. Please list some basic commands that I need to learn to operate it via termianl.
0
votes
1answer
19 views

How to test outoing traffic on random ports? (I'm on OS X)

In some situations or on some locations, I'm struggling with restricted outgoing traffic. For example a restricted LAN where outgoing traffic is only allowed on limited ports. I know how to check or ...
0
votes
1answer
29 views

Find the com port of a specific device on command prompt

I know we can find it out from the device Manager under ports. But I want to be able to get this info on command line so I can incorporate it in my python script. I looked at tools like WMI, Devcon. ...
0
votes
1answer
61 views

What happens if all of the Ephemeral Ports are used in Windows?

If all of the Ephemeral Ports are used, and another socket tried to connect to a server, will the connection fail? or will the socket be assigned a port outside the range of the Ephemeral Ports?
0
votes
1answer
64 views

What is the default range of Ephemeral Ports in Windows 7?

I used the following command to get the Ephemeral Ports range in Windows 7: netsh int ipv4 show dynamicport tcp And the result was the following: Protocol tcp Dynamic Port Range -------------------...
0
votes
0answers
45 views

IIS 8 / Windows Server 2012 R2 - PID 4 using Port 443

So I had an issue a little while ago with port 80 being used by PID 4. But I solved this issue here. But now I'm trying to setup a binding to localhost 443 in IIS and again it can't do it. Ran the ...
7
votes
4answers
45k views

Is there a simple way to detect ISP port blocking?

Is there a way to tell the difference between my ISP blocking traffic on certain ports and my NAT router/firewall blocking that traffic? The sites “Shields Up” and “Can you see me” show my ports ...
0
votes
0answers
18 views

QNAP Nas File Server outside LAN

I am trying to map my NAS as a network drive outside my LAN however I have very limited knowledge around this. I have a QNap TS-212P which is configured to port forward so I can access it's GUI ...
1
vote
2answers
66 views

Why DisplayPort, HDMI port etc. while USB can do the job? [closed]

I've been using HP EliteDisplay E232 connected to my hp notebook HP ZBook 15 G2 through DisplayPort for some time now. Both the monitor and the notebook has Full HD 1920X1080 resolution. I was so glad ...
0
votes
0answers
43 views

port forwarding - Transmission torrent client

I have a problem related to Transmission torrent client. Specifically on a Fedora 23 Linux distribution. My goal is to increase download speed and surfing on the internet. I found out the best way to ...
5
votes
1answer
3k views

Cannot start WebSite because port 80 is being used by W3SVC.exe

I have deverloped a website at work and we typically use port 80/443 for our websites (in development). This has worked well until today when starting the website gives me the error (IIS 7) This ...
1
vote
1answer
561 views

Block port 111 on centos 7

I am using a server with centos 7 running kvm/virtualization, I access using VNC server. Today I received an warning about my server being used to attack other server using port 111, I am completely ...
0
votes
0answers
27 views

Port translation and websphere application

I have a java application running in Websphere Application Server (WAS) on port 80 (using IBM HttP server, IHS). Now I need port 80 for other purposes on my external ip. I just setup port translation ...
1
vote
2answers
1k views

How can I tell if ISP is blocking outgoing ports?

1st: How can I tell if ISP is blocking ports? 2nd: How can I tell if problem is related to OS? Problem began since upgrade to Windows 10. (Business computer, hence I don't know if I have privileges)...
0
votes
1answer
23 views

How can i access remote ports other than 80 from my home network?

I am trying to access a remote website running on port 8000. From my home network i cannot (it simply times out), but i can access it from my phone's 3G network. My ISP is Bezeq International and the ...
12
votes
2answers
10k views

Difference between port mapped and memory mapped access?

Can anyone explain what's the difference between port mapping and memory mapping, and what having both accomplishes? Why is there port mapped, how does it differ in structure from memory maps, and is ...
0
votes
1answer
29 views

Does port triggering from port 80 to port 80 make sense?

In troubleshooting a VoIP quality issue, tech support had me set up numerous port triggering ranges. One of the ranges was: Triggered Range: 80 to 80 Forwarded Range: 80 to 80 Based on my probably-...
7
votes
5answers
46k views

USB Ports Not Working

None of the USB ports work anymore on my HP EliteBook 2540p laptop which is running Windows 7 Pro SP1. By "not working," I mean if I try plugging in a thumbdrive or external HDD it does nothing ...
0
votes
1answer
52 views

I cannot connect to a port that is already open in my firewall

I have tried to open port 80 [root@rhel7 docker]# firewall-cmd --zone=public --add-port=80/tcp --permanent success [root@rhel7 docker]# firewall-cmd --reload success [root@rhel7 docker]# iptables-...