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Questions tagged [port]

A port is a communication end-point in the context of network communications or an interaction point for inter-component interactions. Do not use this tag for software ports from one platform or language to another, but use the tag "porting" instead.

port
3348 votes
34 answers
5.6m views

How do I find out which process is listening on a TCP or UDP port on Windows? [closed]

How do I find out which process is listening on a TCP or UDP port on Windows?
readonly's user avatar
  • 351k
1483 votes
35 answers
2.9m views

How to kill a process running on particular port in Linux?

I tried to close the tomcat using ./shutdown.sh from tomcat /bin directory. But found that the server was not closed properly. And thus I was unable to restartMy tomcat is running on port 8080. I ...
veer7's user avatar
  • 21.1k
1144 votes
38 answers
537k views

What is the difference between a port and a socket?

This was a question raised by one of the Software Engineers in my organisation. I'm interested in the broadest definition.
Richard Dorman's user avatar
1129 votes
14 answers
1.5m views

scp with port number specified

I'm trying to scp a file from a remote server to my local machine. Only port 80 is accessible. I tried: scp -p 80 [email protected]:/root/file.txt . but got this error: cp: 80: No such file ...
One Two Three's user avatar
1077 votes
65 answers
1.2m views

How to configure port for a Spring Boot application

How do I configure the TCP/IP port listened on by a Spring Boot application, so it does not use the default port of 8080.
Paul Verest's user avatar
  • 62.6k
894 votes
30 answers
2.0m views

How to kill a process on a port on ubuntu [closed]

I am trying to kill a process in the command line for a specific port in ubuntu. If I run this command I get the port: sudo lsof -t -i:9001 so...now I want to run: sudo kill 'sudo lsof -t -i:9001' ...
Tampa's user avatar
  • 77.4k
780 votes
17 answers
1.0m views

How do I assign a port mapping to an existing Docker container?

I'm not sure if I've misunderstood something here, but it seems like it's only possible to set port mappings by creating a new container from an image. Is there a way to assign a port mapping to an ...
thasmo's user avatar
  • 9,638
758 votes
8 answers
318k views

What is the difference between "expose" and "publish" in Docker?

I'm experimenting with Dockerfiles, and I think I understand most of the logic. However, I don't see the difference between "exposing" and "publishing" a port in this context. All the tutorials I ...
user1496984's user avatar
  • 11.3k
538 votes
13 answers
2.3m views

How do I determine if a port is open on a Windows server? [closed]

I'm trying to install a site under an alternative port on a server, but the port may be closed by a firewall. Is there a way to ping out or in, on a specific port, to see if it is open?
Jason's user avatar
  • 16.9k
461 votes
5 answers
407k views

How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]

I understand the basics of how ports work. However, what I don't get is how multiple clients can simultaneously connect to say port 80. I know each client has a unique (for their machine) port. Does ...
IamIC's user avatar
  • 18.1k
448 votes
37 answers
683k views

Port 80 is being used by SYSTEM (PID 4), what is that?

I am trying to use port 80 for my application server, but when I perform netstat -aon I get: TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4 When I look up the process in task manager, it shows PID 4 is SYSTEM,...
GiH's user avatar
  • 14.4k
422 votes
9 answers
421k views

git remote add with other SSH port

In Git, how can I add a remote origin server when my host uses a different SSH port? git remote add origin ssh://user@host/srv/git/example
JuanPablo's user avatar
  • 24.4k
416 votes
19 answers
485k views

Get protocol, domain, and port from URL

I need to extract the full protocol, domain, and port from a given URL. For example: https://localhost:8181/ContactUs-1.0/contact?lang=it&report_type=consumer >>> https://localhost:8181
yelo3's user avatar
  • 5,893
408 votes
47 answers
846k views

Node.js Port 3000 already in use but it actually isn't?

I have been working with a node.js project for a few weeks and it has been working great. Usually, I use npm start to run my app and view it in a browser on localhost, port 3000. Today, I started to ...
user2573690's user avatar
  • 5,863
385 votes
18 answers
644k views

Test if remote TCP port is open from a shell script

I'm looking for a quick and simple method for properly testing if a given TCP port is open on a remote server, from inside a Shell script. I've managed to do it with the telnet command, and it works ...
Yanick Girouard's user avatar

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