Questions tagged [sockets]

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534 votes
8 answers
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How to know what program is listening on a given port?

I suspect a program is listening on port 8000 on my machine. When I run the following command, I get this error: > python -m SimpleHTTPServer # Lots of python error socket.error: [Errno 98] ...
yansal's user avatar
  • 5,443
41 votes
2 answers
48k views

What are socket files?

Recently, I started using tmux; I'm trying to use the pair programming feature in that software. During the process a socket file was created. My question is: what are socket files, how am I to open ...
Moha the almighty camel's user avatar
11 votes
1 answer
7k views

Launching programs after hostname change returns error _IceTransSocketUNIXConnect: could not connect to local-host

After changing the hostname on 14.04 I cannot launch unetbootin, attempting to launch the application from bash returns: _IceTransSocketUNIXConnect: Cannot connect to non-local host OLDHOSTNAME ...
Oatlad's user avatar
  • 111
10 votes
4 answers
25k views

How can I create a new socket in /dev?

I want to create a new socket file in /dev. Does the way to get it is adding a new rule to udev?
Marc's user avatar
  • 481
9 votes
5 answers
61k views

Unable to start Apache on Ubuntu 12.10: no listening sockets available

I'm unable to start apache2 installed using apt-get. I'm getting the very same error on 2 separate Ubuntu 12.10 installations, one on my desktop PC, the other one running in VirtualBox: michal@...
michalstanko's user avatar
9 votes
1 answer
29k views

Can't start MySQL server if the .sock file is changed in /etc/mysql/my.cnf

I have installed MySQL server 5.5 on Ubuntu 12.04. I am trying to start MySQL server on a different sock file. By default MySQL runs on /var/run/mysqld/mysqld.sock. I am trying to run the same server ...
user117844's user avatar
8 votes
1 answer
69k views

how to stop socket with linux command?

how to stop socket in linux : socket ==> root@root:/home/aa/test# netstat | grep 3966 tcp 0 0 server:3966 server:57004 TIME_WAIT thank
Ellouze Anis 's user avatar
7 votes
3 answers
12k views

Mysql install ERROR: Database files are locked. Daemon already running? Warning: Unable to start the server

At first I removed previous MySQL installation apt autoremove mysql-server-8.0 MySQL has been removed from services. Then I tried to install new MySQL apt install mysql-server which throws me an ...
Čamo's user avatar
  • 729
4 votes
1 answer
399 views

Server stops accepting connections after ~120,000 active on 18.04.3

I'm running a type of perf test where I have a simple TCP server with 4 IP addresses that is listening on a port and getting connections from several other computers on the local network. Everything ...
Denis's user avatar
  • 61
4 votes
0 answers
5k views

How to restart a systemd socket?

Problem in a nutshell: systemd creates a socket on boot, but it is not possible to restart or recreate it without a reboot. /etc/systemd/system/gunicorn.socket [Unit] Description=gunicorn socket [...
leggewie's user avatar
  • 1,028
4 votes
0 answers
9k views

Mariadb Plugin 'unix socket' is not loaded

After installing Mariadb on Ubuntu 15.10 I was unable to use mysql. The following error was reported: Plugin 'unix socket' is not loaded. It seems that plugin table in the mysql db was empty. Why ...
iainH's user avatar
  • 798
4 votes
0 answers
3k views

Bluetooth Socket Program: connect: Host is down

I am trying to test rfcomm_server.c and rfcomm_client.c (from the link https://github.com/balle/bluetooth-snippets) on my new Bluetooth dongle. When I run rfcomm_client, it exits on connect giving ...
UbflPM's user avatar
  • 41
3 votes
2 answers
5k views

Clamav-daemon on Ubuntu 16.04.6 LTS: Why is clamd socket file not created in /var/run/clamav?

On Ubuntu 18.04 server a socket file is created when starting clamav-daemon without problem. On an older server using the 16.04.6 LTS the socket file is just not created whatever I tried. Even I ...
soundzentrum's user avatar
3 votes
2 answers
3k views

postgresql broken after 14.04 despite succesful pg_upgrade

I'm running an Ubuntu VPS where i'm am upgrading to 14.04. everything has gone smoothly so far. Except the PostgreSQL migration from 9.1 to 9.3. The server hosts a Django 1.6 site and the traceback ...
Thyssen's user avatar
  • 31
3 votes
1 answer
4k views

/var/run/postgres keeps being deleted, preventing postgres from starting

By default, my PostgreSQL installation was creating a socket in /tmp but my psql command-line client was looking in /var/run/postgresql/.s.PGSQL.5432. To remedy this, I edited postgresql.conf and ...
sparkyspider's user avatar
2 votes
1 answer
2k views

How do I discover my socket type?

I want to upgrade my CPU, but Ubuntu's "About This Computer" window only gives me "Intel® Core™ i3 CPU 530 @ 2.93GHz × 4", so no information on the connector/socket type. So far, I've tried the ...
Waldir Leoncio's user avatar
2 votes
1 answer
1k views

How would I know if my OS is compromised?

I had opened a php folder from a friend's web host. I run it on mine to fix some bugs. Then I tried attaching the code to be emailed and GMAIL stated that the attachment was infected by a virus. Now ...
itsols's user avatar
  • 1,140
2 votes
1 answer
2k views

Pipe an infinite stream to internal loop?

I've seen a lot of things about redirecting stdout to a TCP socket, but no real example of how to do it in practice, specifically when the output stream generated by the first "command" never ends. ...
Jonathan H's user avatar
2 votes
5 answers
11k views

iriunwebcam doesn't work on 20.04

iriunwebcam (https://iriun.com) has worked fine on Ubuntu 20.04 LTS as well as on Ubuntu 20.04 beta on another VMware virtual machine, while it won't still work on a real PC. Also it works fine in ...
hakanekat's user avatar
2 votes
1 answer
3k views

Why is python listening on port 8000?

Dears, I wanted to ask if anybody has details on why python is listening to port 8000 (local and remote connections as well). Can it be a backdoor ? I tried to telnet to the ip/port and the ...
cybertig's user avatar
2 votes
1 answer
22k views

ConnectionRefusedError: [Errno 111] Connection refused

Executive Summary. I get "connection refused 111" when trying to communicate over sockets in Python. When the connection is refused, THE LISTENER STOPS LISTENING. Same problem occurs using ...
victor ludorum's user avatar
2 votes
1 answer
3k views

Communicating via a local socket or named pipe

I'm reading a book that is related SSH. I can't figure out what this sentence means. SSH clients communicate with the agent via a local socket or named pipe whose filename is stored in an ...
Smile's user avatar
  • 1,099
2 votes
1 answer
9k views

Failing to Start gunicorn.service using systemd

gunicorn.socket [Unit] Description=gunicorn socket [Socket] ListenStream=/run/gunicorn.sock [Install] WantedBy=sockets.target gunicorn.service [Unit] Description=gunicorn daemon ...
Srinivas Nani's user avatar
2 votes
1 answer
326 views

what is the path start with @

What is the @ character in beginning section of sockets's path in output of "netstat -a" command? unix 3 [ ] STREAM CONNECTED 10868 1261/X @/tmp/.X11-unix/X0 unix 3 ...
user179902's user avatar
2 votes
0 answers
454 views

How to allow an apparmor profile to create a unix socket

On Ubuntu kinetic, I get multiple DENIED operations by apparmor in /var/log/syslog such as: operation="create" class="net" info="failed type and protocol match" error=-13 ...
jean-christophe manciot's user avatar
2 votes
0 answers
450 views

exclude socket files during diff -r

diff has an option --recursive (-r) to do a comparison between two directories (the files inside them). Is there a way to make diff ignore all socket files and only socket files? I am using diff --...
reducing activity's user avatar
2 votes
0 answers
135 views

Concurrent Multipath Transfer over SCTP

I'm trying to run Concurrent Multipath Transfer over SCTP. I have two machines running Ubuntu Server 10.04 LTS, and they have lksctp-tools 1.0.11+dfsg-1 installed Does this version support CMT? if ...
loo3y35's user avatar
  • 511
2 votes
0 answers
365 views

Tiger: `rtm` is listening on socket XXXX

On my Ubuntu serve 12.04 LTS, Tiger is reporting a lot of stuffs like this: OLD: --WARN-- [lin002i] The process `rtm' is listening on socket 60404 (UDP) on every interface. NEW: --WARN-- [lin002i] ...
Adeline's user avatar
  • 365
2 votes
1 answer
73 views

Socket communiction in absence of wired network connection

I am facing a strange issue on my Ubuntu (12.04.3 64 bit). I have a couple of C programs communicating (let's call them sender and receiver programs) through sockets. These work as expected when the ...
Bhanu Kiran's user avatar
1 vote
1 answer
335 views

Why does KeePassXC creates a socket file in tmp folder

Im new to Ubuntu. Just started to use KeePassXC and noticed when KeepPassXC is launched, it creates a .lock and .socket file in the tmp folder. Im trying to figure out what these files are, what they ...
Noob's user avatar
  • 49
1 vote
1 answer
66 views

Use a "t" in a socket already used by another process

I want to read (man-in-the-middle, if you will) traffic on a socket that another process has already opened. I am doing this for debuging purposes. I have a process (firefox) that is using a ...
josinalvo's user avatar
  • 6,927
1 vote
1 answer
2k views

What exactly is a connection through socket or what does the output of lsof tell us?

I'm streaming some files from S3 to an EC2 instance to get summary data from the headers. I use key.close(fast=True) for all the keys I get from boto.s3.bucket.Bucket.list() (python library to access ...
ehacinom's user avatar
  • 115
1 vote
1 answer
2k views

How to know if socket server is working

I am creating a socket server using c, but the client will be an arduino board so i would like to know if there is a way to be testing my code without the client since the arduino is yet to arrive.
sosytee's user avatar
  • 2,698
1 vote
1 answer
458 views

Generate a dir for unix sockets WITHOUT systemd

In normal Ubuntu I used to create a dir for Unix sockets as follows (say for project foo): Create a systemd script in: /usr/lib/tmpfiles.d/foo.conf Place the following code in the script: /run/foo ...
run_the_race's user avatar
1 vote
1 answer
928 views

How to send packets at 512 nano sec delay using Socket Programming and UDP socket

Using SOCK_DGRAM for UDP sockets All packets are 22 bytes in length (ie 64 including headers) client.c ... no_of_packets--; sprintf(buf, "#:!0 rem"); sprintf(buf, format , buf); ...
Anuraag Tummanapally's user avatar
1 vote
1 answer
1k views

#include <SFML/Network.hpp> not found

Can someone help me out with this error. Trying to program a network scanner cppns.cpp:2:10: fatal error: SFML/Network.hpp: No such file or directory #include <SFML/Network.hpp> ^~~~~...
Gilfoyle's user avatar
1 vote
1 answer
871 views

Problem in reading from socket

I have a spark streaming program, that reads data from a socket I have craeted using: nc -lk 9999 The program reads the data from socket and exclude the "Error" messages. When I write manually in ...
Ali Majed HA's user avatar
1 vote
1 answer
4k views

How can I change Maximum segment lifetime in Ubuntu 14.04

How can I change maximum segment lifetime in Ubuntu 14.04? there is no net.inet.tcp.msl there The problem is that I need my TCPsockets to live more than 240 seconds..
KostyaBorisenko's user avatar
1 vote
1 answer
4k views

TCP IP Socket Client - Available Options?

I deal with a lot of socket programming and I need a client that can connect to a listening server and be able to send both JSON and XML. Is there any software that is capable of that? I tried ...
Stefano Mtangoo's user avatar
1 vote
1 answer
3k views

Unable to connect to running ssh-agent

I connect to a long-running screen session on Ubuntu 12.04 server, and use that as a jump box for other things I connect to. As a result, I want a long-running ssh-agent on that machine. To that end, ...
pdickey's user avatar
  • 21
1 vote
1 answer
5k views

Make an accesible Python server

I'm using the Python library socket to create a program, and I want to be able to allow my friends to connect from their homes. I have the rest of the program running and it works great on the ...
RPiAwesomeness's user avatar
1 vote
0 answers
170 views

MySQL does not create socket when launched at boot

After a reboot, mysqld is running, but no socket gets created and you cannot connect to the MySQL server: # mysql ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/...
Paul Schreiber's user avatar
1 vote
0 answers
146 views

Why is there less latency and jitter when there is additional high bandwidth traffic between two computers with Ubuntu 22.04 installed on them?

I have two computers that are connected via an Ethernet cable with Ubuntu 22.04 installed on them. I have a client on computer A) which is sending UDP packets to a server on computer B) and I am ...
Nandor Takacs's user avatar
1 vote
1 answer
130 views

Game dedicated server application crash/delay after some time on Ubuntu 20.04

I've been running a game server application which, after some time, crashes with all the people connected to it (packets delay for one/two minutes making most people disconnect although the ...
user avatar
1 vote
0 answers
2k views

zmq.error.ZMQError: Address already in use

I have installed Anaconda (python 3.7) in my ubuntu 20.04 system. However, while running my Python code from the Spyder console, I am getting the following error: An error occurred while starting the ...
user14263018's user avatar
1 vote
0 answers
181 views

Cannot open chromium neither by the icon nor by the terminal, the following message appears:

$ chromium-browser error: cannot communicate with server: Post http://localhost/v2/snapctl: dial unix /run/snapd-snap.socket: socket: permission denied Trace/breakpoint trap (core dumped) I will ...
PMF's user avatar
  • 53
1 vote
1 answer
4k views

outward traffic blocked

So I have this web server which is accepting incoming traffic and is able to serve back replies. However, if the server has to initiate any kind of traffic (icmp/tcp..) it fails: Its been up for > 600 ...
Steffen Schumacher's user avatar
1 vote
0 answers
1k views

nslookup working fine but ruby http call throwing error - getaddrinfo: Try again (SocketError)

nslookup and dig are resolving the address but ruby program throwing error. here is the stack trace 10: from /usr/local/bundle/gems/rest-client-2.0.2/lib/restclient.rb:67:in `get' 9: from /usr/...
Vinujan.S's user avatar
  • 111
1 vote
2 answers
516 views

Wrap tcp listener script so that it uses a sock file instead

I have a program when run, starts listing on on port 12345 $ ./cool_script.pl My linux administrator says it's against the policy to open ports. He says I'm allowed to use ~/cool_script.sock (unix ...
american-ninja-warrior's user avatar
1 vote
1 answer
1k views

how to send data from virtual machine to host

I have a virtual machine (Ubuntu) and I need to send data through socket communication to my host PC (Ubuntu as well). Is there a way to do it? I found out that the localhost of the PC and VM are the ...
Luigi's user avatar
  • 11