Questions tagged [sockets]
A communication end-point for networking, for CPUs please use [processor-socket]
279
questions
232
votes
7
answers
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Allow non-root process to bind to port 80 and 443?
Is it possible to tune a kernel parameter to allow a userland program to bind to port 80 and 443?
The reason I ask is I think its foolish to allow a privileged process to open a socket and listen. ...
- 12.2k
148
votes
15
answers
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views
Manually closing a port from commandline
I want to close an open port which is in listening mode between my client and server application.
Is there any manual command line option in Linux to close a port?
NOTE: I came to know that "only ...
codingfreak
124
votes
2
answers
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views
Can cURL send requests to sockets?
I have a HTTP server running at /var/run/my-server.sock, and I want to test it by sending a simple request using cURL. Can this be done using cURL? Can it be done at all, or must there be a reverse ...
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93
votes
6
answers
93k
views
Can I monitor a local unix domain socket like tcpdump?
I'd like to monitor responses on a unix socket without disturbing the original connections and pipe them to a script for processing.
I know how to do this with tcpdump for tcp connections but I ...
- 1,905
68
votes
2
answers
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Why was port 80 chosen as the default HTTP port and 443 as the default HTTPS port?
Why was port 80 chosen as the default HTTP port and 443 as the default HTTPS port?
Is there a reason or was it is just defined that way?
- 813
43
votes
3
answers
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Linux named sockets howto
I know that there are named sockets & named pipes (fifo) in Linux.
In ls -l, they would look as below: (I have changed the filenames, for demonstration.)
prw-r--r-- 1 root root 0 Nov 8 16:31 /...
- 905
36
votes
6
answers
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How to determine the socket connection up time on Linux
I can verify that the connection is up:
$ netstat -tn | grep "192.168.2.110"
tcp 0 0 192.168.2.100:10444 192.168.2.110:52639 ESTABLISHED
is there a way to check how long this tcp port connection ...
- 463
22
votes
1
answer
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What is the simplest way to test a plain socket server
I have a server which listens on a socket for incoming connections and outputs a welcome text ("Hello world"). What is the simplest way to test this with plain tools from the operating system (here OS ...
- 5,797
22
votes
1
answer
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how to view haproxy status on the command line using a socket
In the examples, I have seen on the net
https://www.datadoghq.com/blog/how-to-collect-haproxy-metrics/#show-me-the-metrics
You can use the command line
echo "show stat" | nc -U /var/lib/haproxy/...
- 13.7k
19
votes
3
answers
32k
views
Difference between localhost and the ip address
If bind a socket in Python to localhost,8200 this is accessible via http://localhost:8200/. but not http://x.x.x.x:8200/
If bind a socket in Python to x.x.x.x,8200, machinename,8200 this is ...
- 400
16
votes
1
answer
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views
How to expose Linux socket file from Docker container (MySQL, MariaDB, etc.) to host
Disclaimer: I am not looking for a way to configure MySQL/MariaDB to use TCP connections. I am aware of that option and the question is not about that aspect.
I am having trouble binding a socket ...
- 379
14
votes
3
answers
7k
views
Does Windows take care of closing sockets when processes exit?
I've read up this question about Linux, Can a port be bound when the process has terminated?
Linux appears to clean up after processes exiting, and leaving open sockets. I was wondering if there's any ...
- 242
14
votes
3
answers
9k
views
Determining what process has bound a port (without listening) on Windows
If I want to find out what process is listening on what socket, I can use netstat/TCPview and will immediately see it. However, it is possible to bind to an address without listening. If this is done, ...
- 1,132
14
votes
2
answers
52k
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Connect a M.2 (B & M) key SSD into a B socket
I have bought a SSD with M.2 socket (B & M) key, but my computer just have a B key socket. My question is if I can connect the SSD in this B socket, and would it work correctly?
- 263
13
votes
1
answer
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How does the OS tell whether an "Address is already in use"?
If my C program uses sockets, binds to localhost:9025, exchanges some data, gets manually killed and restarted, it sometimes crashes with the error being:
Address already in use.
All SE-...
- 243
12
votes
1
answer
7k
views
Is sharing a tmux sockets between hosts possible?
I'm wondering if it's possible to share a tmux server socket between different hosts. For example, I have a virtual machine (guest) running inside my host, and I'm running a tmux session in the guest, ...
- 243
12
votes
4
answers
13k
views
sshfs mounting linux directory from mac stopped working
Until this morning, I'd been using sshfs quite nicely to mount a directory from a linux machine in my office. Today, it stopped. Here's my sshfs command:
sshfs -osshfs_sync,volname=linux-builder3 ...
- 2,373
10
votes
2
answers
2k
views
What is non-networked Unix domain socket?
I am reading Unsecured docker daemons revealed
It says
Docker daemon creates a non-networked Unix domain socket at /var/run/docker.sock
What does non-networked Unix domain socket denote?
- 501
10
votes
1
answer
5k
views
Tell GNU screen where to save the sessions?
My GNU screen stores its sessions in the /tmp directory.
That means that after a reboot, all sessions are lost:
$ screen -list
No Sockets found in /tmp/uscreens/S-dehmann.
How can I tell it to ...
- 2,323
9
votes
1
answer
5k
views
Does Mac OS X throttle the RATE of socket creation?
This may seem programming related, but this is an OS question.
I'm writing a small high performance daemon that takes thousands of connections per second. It's working fine on Linux (specifically ...
- 193
8
votes
1
answer
7k
views
Given that tar ignored my 2 sockets, how do I backup and then restore my login folder?
I did a network backup of my login area in preparation for reformatting the volume in which it resides to make it bootable on my old Power Mac G5 running the very latest release of Leopard.
Though ...
- 1,721
7
votes
2
answers
1k
views
Is it possible to interchange these two sockets since the cables in the wall look the same?
My Ethernet socket isn't working and I'm convinced it has to do with either the socket itself or the cable behind the wall. This picture of my wall sockets (the left the Ethernet socket, the right a ...
- 230
7
votes
1
answer
21k
views
Force socket close
Is it possible to close an established socket connection in Windows "manually" (e.g. using a command prompt tool)? I have several open sockets connected to a listening server, I can see them using ...
- 1,146
7
votes
3
answers
11k
views
Is it bad practice to listen on 0.0.0.0? Why?
Say I want to deploy a software that acts as a server and I want to avoid scenarios where interfaces are replaced, IP addresses are changed, etc.
The nature of the environment in which this software ...
7
votes
2
answers
4k
views
Remote listening of UNIX sockets
I'd like to be able to remotely listen to UNIX sockets in order to make programs such as dtach, which only support listening to UNIX sockets, work remotely. I've read about socat and how it's able to ...
- 1,117
7
votes
1
answer
3k
views
What is this socket/port/connector on my laptop? [duplicate]
I've have this socket on my laptop (Lenovo Z570).
What is this port and what is it used for?
And what does that symbol mean (I expected a LOCK symbol)?
- 91
6
votes
1
answer
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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 ...
- 61
5
votes
5
answers
16k
views
What is the difference and relationship between a process id and a port number?
Process is a program in execution. E.g. Firefox.
I don't understand the relationship and the differences between the terms "process" and "ports".
When I run netstat -no -p -TCP on cmd I can see ...
- 215
5
votes
1
answer
1k
views
Does TCP/UDP send file sequentially or randomnly?
Does TCP/UDP protocol always send or receive file packets sequentially? Would it possible to make a choice which data packets will be sent first using sockets API?
- 53
5
votes
2
answers
2k
views
Linux localhost sockets painfully slower than on Mac
This question is based on this thread over at OpenOffice.
I'm using Python and the Office UNO bridge to analyze documents. For the most part I run on my Mac and spin up an office instance to listen ...
- 103
5
votes
2
answers
9k
views
Where to put Unix sockets?
I am new to this, so sorry if its obvious. I am running a Debian server and installing the likes of UWSGI, Nginx etc on there. The configurations keep talking about pointing to "sockets".
In ...
- 267
5
votes
1
answer
619
views
No-socket alternative to tmux or screen
My university gives each student a directory on their AFS which is accessible via SSH. There is a (light) CLI-driven piece of software that I would like to run continuously from the university.
I ...
- 1,437
5
votes
1
answer
4k
views
How do I run mysqld as a regular non-daemon program?
I'd like to run a local copy of mysql, to keep software development environments isolated. However, I can't seem to get the mysqld server to start up.
I've created a database directory with ...
- 1,006
5
votes
1
answer
3k
views
How to list socket options of running processes?
Is there a convenient way (e.g. a readily-available command or a program that I can write using standard system calls) to list socket options (e.g. TCP_NODELAY) of an open TCP socket of some running ...
- 453
5
votes
2
answers
6k
views
Data retransmission and WSAECONNABORTED (10053) socket error
Say I have two sockets that are connected to each other (Socket A and Socket B).
If the computer that have Socket B is unplugged from power, then if Socket A tries to send some data to Socket B, the ...
- 51
5
votes
1
answer
2k
views
How does SSH tunneling work at low level?
I am interested in the exact mechanism that occurs when an SSH tunnel is stablished.
Supposing we have 3 computers: LOCAL host, INTERMEDIATE host, and REMOTE host, with this topology:
Localhost --- ...
- 153
5
votes
1
answer
3k
views
Bridging two sockets
I wondered if it is possible to bridge two incoming tcp sockets.
For example:
Client A -----> Server <----- Client B
The the server sends it's magic to both clients and then they connect to ...
- 372
5
votes
1
answer
3k
views
How to free a port on OS X when lsof(1) reports that it is not in use
I am a developer working in OS X on Eclipse. A bug I have been working to fix in a web application results in some very strange behavior when resetting an instance of Tomcat, resulting in the ...
- 1,239
4
votes
1
answer
2k
views
Where is "unix:abstract=/tmp/dbus-KtyPDgWNin" socket file saved?
I try the following:
roroco@roroco ~/Dropbox/rbs/ro_cmds $ echo $DBUS_SESSION_BUS_ADDRESS
unix:abstract=/tmp/dbus-KtyPDgWNin,guid=ca3ea893cf45d42ef60e74d0545d84f6
But when I want to list this socket ...
4
votes
5
answers
27k
views
How to determine why port 443 is already in use?
I'm running Apache 2.4.10 on a Windows 7 machine and am trying to add SSL connections. Port 80 connections work fine, and I'm trying to add port 443. When the httpd.conf gets Listen 443 added it ...
- 7,978
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votes
2
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TCP: Maximum number of connections (client and server)
In the description of TCP in the Wikipedia, it is stated that
The number of sessions in the server side is limited only by memory and can grow as new connections arrive, but the client must ...
- 1,311
4
votes
1
answer
5k
views
How can I know what is preventing my socket to bind to localhost:50060-50959
I am using this Python code to listen to a port on my Windows 10 system:
import socket
for port in (50059, 50060, 50959, 50960):
try:
print(socket.socket(socket.AF_INET, socket.SOCK_STREAM)....
- 1,718
4
votes
1
answer
11k
views
What do Intel's socket package specifications mean in detail?
What is the difference between
FCPGA988
PGA988
rPGA
rPGA988B
BGA1224
FCBGA1224
Do some mean that the BGA is soldered to the board and cannot be removed? BGA is soldered versions only, right?
What ...
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4
votes
1
answer
4k
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
--------------------...
- 43
4
votes
1
answer
925
views
What happens when I terminate a process and the socket send buffer is not empty?
In Windows (and probably in other operating systems), if a process has a TCP connection with another process on another machine, and then I terminate the process, an RST packet will be sent to the ...
- 41
4
votes
1
answer
2k
views
SocketSniff equivalent for 64-bit applications
SocketSniff allows you to watch the Windows Sockets (WinSock) activity of the selected process.
On x64 version of Windows, SocketSniff can only work with 32-bit programs.
Is there any SocketSniff ...
- 732
4
votes
0
answers
8k
views
Can't connect to socket listening on 127.0.0.1 but works for 'localhost' in Windows 10
I have a clean install of Windows 10 Pro x64 and I’m trying to run PostgreSQL server on it. It used to work perfectly on Windows 7, but Windows 10 is behaving really weird: If I configure PostgreSQL ...
- 41
4
votes
1
answer
2k
views
How do I troubleshoot if I see the incoming packet in tcpdump, but not at the socket?
For example, I see that the incoming packet in tcpdump, but not in strace for the program that is listening the appopriate socket.
How do I trace the "fate" of this incoming packet on Linux?
I ...
- 17.3k
3
votes
3
answers
1k
views
How does HTTP Keepalive handle multiple requests along with EOF from same origin?
says a client has multiple files to post to a server via HTTP Post method, there will be two api calls. since I don't want to create two TCP connections and I want to reuse TCP connection, so I use ...
- 135
3
votes
2
answers
32k
views
How to communicate between two VirtualBox VMs running on same host
I am running two VM instances of RHEL/CentOS on my VirtualBox instance running on host Windows 7. The problem is when I am executing VBoxManage list vms -l | more and then sunsequently VBoxManage ...
