Questions tagged [socket]

Question 1

I'm experiencing a socket leak in a network-intensive application where the number of sockets in the 'closed' state reported by ss -s does not match the actual count from detailed commands. Here are ...

Question 2

I'm trying to bind libvirt daemon TLS socket to a specific ip address (10.10.10.254) configured on one end of the VETH pair. I modified /etc/libvirt/libvirtd.conf file accordingly to the libvirt docs: ...

Question 3

I'm running Coraza SPOA on a HAProxy VM and encountering a recurring error in the logs: root@haproxyvm:~/coraza-spoa# tail -f /var/log/coraza-spoa/coraza-agent.log 3:44PM PNC Error handling request ...

Question 4

I'm encountering a persistent issue where a TCP port remains stuck in the LISTENING state, but the process that allocated it cannot be found. This happens even though the application that originally ...

Question 5

Suddenly after restarting the machine, I have been facing this error can't connect to MySQL server and table plus is not able to connect with localhost 127.0.0.1. The steps below worked for me, and ...

Question 6

I have a device (Blackmagic 2110 IP Converter 3x3G) connected to my PC that is sending me some ST-2110 video stream over 239.255.2.164. I need to receive this data. My NIC does not have any IP address ...

Question 7

ss -tm shows detailed memory information about each TCP session. I found that some of the tcp sessions show sock_drop, here is one: ESTAB ***** some irrelevant info here **** ...

Question 8

I'm aware of two main ways to write and receive network packets from an existing network interface on linux. The first is with the classic sockets API, in which the linux kernel is responsible for ...

Question 9

I need a config for apache 2.4 which just connects to an open socket and talks fcgi over it. I am writing my own fcgi-enabled web app. By now, it opens a listening socket and when a web server (nginx ...

Question 10

We have a client/server implementation, where the client continuously, periodically sends data at 800Hz over ethernet. The packets are small so we're significantly under the network bandwidth limit. ...

Question 11

My understanding, from various sources (e.g. here and here) is that raw sockets are not affected by iptables rules. However in practice, I am seeing iptables prevent me from sending packets on a raw ...

Question 12

I have the strange issue that a session without obvious cause hangs and timeouts. The session is a syslog stream with rather high volume, and traffic only flows from client to server. In capture files ...

Question 13

This article: It’s always TCP_NODELAY. Every damn time. suggests, as a bottom line, to set TCP_NODELAY by default, always. Can I do that on a (recent) GNU/Linux system... As root, for all sockets ...

Question 14

I have MySQL running on port 1835, as proven by running the command: lsof -i:1835 The following was run to open the port on the firewall: ufw allow 1835/tcp ufw enable ufw reload But the port cannot ...

Question 15

Suppose both the client as well as the server are on the same machine and they want to do mTLS. They both choose to offload the TLS to Kernel (kTLS). Now when the key exchange happens, given the ...

Question 16

Here is some lightly modified output from netstat (I removed the addresses and names) a@xxxxx:/app# netstat -p Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address ...

Question 17

Direct Return Server overview: The DRS allows real servers to directly reply to a client without going through load balancer (LB). The LB ip (VIP) is configured as a loopback (localhost) ip for the ...

Question 18

I have multiple virtual hosts with unique domain names, users, and root directories for each on Nginx and php8.1-fpm. In the /etc/php/8.1/fpm/pool.d/domain.com.conf contains user = domainuser group = ...

Question 19

I'm facing an issue today I can't explain and I'm hoping someone will be able to put me in the right direction. I have a fleet of EC2 servers running a python script. When a user connects to my ...

Question 20

OS: Ubuntu 20.04.6 LTS I created a service that executes python script checker.py. The problem is this service does not execute python script with root privileges, although sirjay user has root ...

Question 21

I have an old legacy application I’m trying to get to work with our semi-modern network. This application sends log messages as HTTP requests (one log per request) but does so over a single TCP ...

Question 22

when I try to ping my newly created server it shows: vasanth@vasanth-client:~$ ping -c 4 server.ip.name PING server.ip.name (server.ip.address ) 56(84) bytes of data. --- server.ip.name ping ...

Question 23

I installed clamav-daemon on Debian 11 and when I try to start it, it doesn't create the LocalSocket /var/run/clamd.ctl. LocalSocket in my /etc/clamav/clamd.conf: LocalSocket /var/run/clamav/clamd....

Question 24

I have read article https://tailscale.com/blog/case-of-spiky-file-descriptors/ where author investigates anomalies with the amount of open file descriptors. He said that made snapshot of open files ...

Question 25

I have a local website on Debian 11 which is rarely used so I thought I might want to start Apache using systemd socket activation when visiting the site and then shut down after few minutes of ...

Question 26

I'm restructuring my server structure by splitting them up instead of running everything from one server. I looked here but that just specifies what I were already doing in the original setup with ...

Question 27

I'm facing an issue in our environment where I'm starting a ServerSocket (Java), and configuring it to listen on 0.0.0.0. Then I'm creating a network interface, and my client is attempting to connect ...

Question 28

EDIT: The following describes my original question, but as long as I haven't resolved the issue yet, I thought maybe I should change settings inside the created mysql POD instead of mysql config files ...

Question 29

I'm working on a C# application, handling TCP sockets. I have a server application (Hercules) on the remote machine, trying to keep a socket open. I have my application on my machine, subscribing to ...

Question 30

The issue I have a server that reaches pm.max_children (200) without spike in CPU usage. No network traffic (MB out / MB in) but extremely high number of socket allocated that do not get closed. CPU: ...

Question 31

Most of the time, when changing or upgrading a network service, I would do this during maintenance hours but some services are rarely used so it is tempting to just check whether it is currently in ...

Question 32

Sorry my english is not good I want to established connexion from my client socket on my local pc to a host server socket on AWS EC2 instance. I'm trying to follow suggestions from here and code from ...

Question 33

With umask 0022, using default ACL entries default:user::rwx, default:group::rwx, default:mask::rwx and default:other::rwx for a directory, files created with touch (e.g.) have a mask of rw, and ...

Question 34

I need to optimize my web app performance, with that in mind I created two PHP-FPM pools for frontend and backend and their respective users. Both pools are listening to different sockets on /etc/php/...

Question 35

I'm trying to understand how fast different IPC mechanisms are, and I know it's possible to create a Unix Socket as a "file" in a directory on a filesystem, but what I don't understand is ...

Question 36

Say one attempts to bind two sockets respectively on the two addresses "0.0.0.0:12345" and "127.0.0.1:12345". Depending on the platforms I tested this on, the behavior changes. On ...

Question 37

I have a Kubernetes deployment where a pod connects to a client via TCP Socket. On connect and disconnect different events happen. In the dev environment the server can respond to connections, data, ...

Question 38

I am developing a TCP echo server using python and the socket library. I'd like to have a timeout configured for each incoming connection. So to drop and close them if there is inactivity for a ...

Question 39

I am running an Ansible playbook on a fresh Oracle Linux 8 system. It includes a step where it asks systemctl to activate a user Podman socket like so: - name: Enable podman socket vars: userid:...

Question 40

I made a simple chat app for my friends and I to use, but I don't want to host the server on my computer, I want to host it on the web. Does anyone know any good services or tutorials on doing this?

Question 41

I'm trying to find pid of a socket using iptables OUTPUT chain log, or even better adding it into the log. My current iptable rule: sudo iptables -A OUTPUT -j LOG --log-prefix='[PID]' --log-level 7 --...

Question 42

I have a PHP application which is attempting to open a socket connection to a printer through my router. A couple things to note - my networking skills are lacking so I may be missing something ...

Question 43

I've recently upgraded my MariaDB servers from 10.1 to 10.6 and now when I restart services for example wildfly, I get this message : sudo service wildfly restart Failed to get properties: Unit name ...

Question 44

I am trying to create a service with systemd, where I use python3 to create a simple socket and leave it as a daemon, but I have made several attempts but in both cases without any success. For today ...

Question 45

I have some specific group/permissions set for my fail2ban.sock file to make Zabbix able to monitor Fail2ban as described here https://github.com/hermanekt/zabbix-fail2ban-discovery- I added the ...

Question 46

I am trying to learn PHP, and I am setting up the database connection. On Mysql Workbench, I created a database called php, and created a table. Then I created the account "sam"@"...

Question 47

I am running a hello-world http server on an ubuntu EC2 instance, let's say, myurl.com. I am unable to curl it from my client: $ curl myurl.com:4296 curl: (7) Failed to connect to ...

Question 48

Is there any way to listen and execute a command ( for every connection ) while port forwarding with socat? A non-working example to make it more clear: socat TCP-LISTEN:8080,reuseaddr, "exec:ls&...

Question 49

I am new to socket programming and have a couple of questions. For the context, I have a server and client with each having a socket opened: the socket on the server is bounded to INADDR_ANY which ...

Question 50

When I try to find the process for an opened socket using e.g. ss I get the following output: ❯ sudo ss -tulpen Failed to open cgroup2 by ID Failed to open cgroup2 by ID Netid State Recv-Q Send-Q ...