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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.

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 ...
276 votes
18 answers
332k views

How to Set port in next.js

One application is running on port 3000 and I want to run another application on a different port from the default port, which is 3000. How do I change this in React Next.js? My package.json currently ...
0 votes
0 answers
37 views

Is there a way to keep my program alive if the server it needs to connect to is not up and listening yet?

So I've been trying to figure out how to keep my program alive if this separate server that I'm running is not open yet. Right now my program's site pulls up successfully but then the second I try to ...
0 votes
1 answer
10 views

getting Heroku Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch on fastAPI backend app

pardon the question as I am new to backend deployment I have the a very simple program from fastapi import FastAPI from fastapi.encoders import jsonable_encoder app = FastAPI() @app.get('/') async ...
-3 votes
1 answer
116 views

How to interface with a UNIX port? [closed]

I have encountered this same question in numerous forms over the past year, and have not been able to find the solution I am after. As the question has yet again reared its head, I am asking here with ...
30 votes
9 answers
32k views

rsub with sublime and ssh connection refusual

I am trying to use rsub to create tunnel in ssh to sublime text, I run the command rmate .profile but i get the following response. I am using wateroof to open the ports 52968 on 1p4 and ip6, I ...
1 vote
4 answers
18k views

how to resolve this error on wamp?

I am getting following when I test my port apache < port80: ***** Test which uses port 80 ***** ===== Tested by command netstat filtered on port 80 ===== Test for TCP Port 80 is not found ...
0 votes
0 answers
23 views

Backend Port Remains Open When Electron App Exits

I'm doing an electron app, but every time I close or quit the app it leaves a pid hanging from the port that the backend opens. How could I kill all the process when I close the app? This is the ...
-3 votes
0 answers
23 views

Talktalk router forwarded port 80 but still showing as closed [closed]

i port forwarded port 80 for my IIS server but i forwarded it in talktalk but it shows its closed in portchecker. I allowed the firewall to open port 80 inbound and outbound but still no. I cant ask ...
0 votes
0 answers
15 views

In confluent kafka version 7.4.3-ccs, what are the ports 37421, 39821, 40223, 43597 and 43611 are used for and should they be opened by the firewall?

In confluent kafka version 7.4.3-ccs, what are the ports 37421, 39821, 40223, 43597 and 43611 are used for and should they be opened or closed by the firewall? Why I cant seem to find these ports in ...
-2 votes
0 answers
26 views

Port in Ubuntu/Linux is open, not blocked, listening, but not working [closed]

I want to run an uvicorn app on port 8505, but it does not work. If I put the app on port 8506 it does work. It also has been working before... Here my firewall settings: Status: active Logging: on (...
0 votes
0 answers
18 views

Managing PowerShell Session Closure and Client Connections on Windows 10

I am running a Vite application on a Windows machine. However, when I try to close the PowerShell window, it doesn't release the port used by the application. Is there a way to send a Ctrl + C command ...
-4 votes
0 answers
21 views

Why am I not able to run airflow scheduler on my local

I am working on Mac OS Intel and tried to install airflow on local. Initially everything was working fine. airflow webserver as well as airflow scheduler. I accidently closed my terminal on Pycharm ...
124 votes
13 answers
216k views

How to check if a network port is open?

How can I know if a certain port is open/closed on linux ubuntu, not a remote system, using python? How can I list these open ports in python? Netstat: Is there a way to integrate netstat output ...
-1 votes
0 answers
12 views

How to run a react app with wamp with ports 5173 and 3000?

I am using React Node js with wamp server. My react app is running localhost:5174 successfully. Server is running 3000. But If am using virtual host appserver:5174 , front end is working , after ...

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