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Questions tagged [socket]

A socket is an abstract network construct with a sending and receiving side. In most modern operating systems (OS) there are device representations, and programming tools to address sockets.

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1answer
2k views

Writing to Unix Domain Socket from rsyslog

I want to write output messages from rsyslog to a Unix Domain Socket. I want to do this so that I can read the messages from that socket using my script and parse log messages further. I try to use ...
3
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0answers
874 views

Performance issues with Apache + Django + socket.io (long-polling) + Proxy

I'm trying to set up a website with django, apache and socket.io. Thanks to some tutorials and other stackoverflow questions, I managed to make everything work, except for a severe lag, that occurs ...
2
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2answers
668 views

Limit to number of listening ports in linux

I have tried to launch a script to listen to thousands of tcp ports (1000 to 10000) but it appears to be hitting a limit of 1024 listening ports. I've confirmed this via netstat and closed ports above ...
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1answer
79 views

same port opened - one on the asterisk (*) address and one on localhost

running on Mac with two jetty instances i've arrived to this peculiar situation: ~$ lsof -ni :9905 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME java 40320 ******* 394u ...
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1answer
603 views

php-fpm: What is the bottleneck for accepting connections faster?

On a php5-fpm status page, what is the bottleneck that is preventing my server from accept()'ing new sockets fast enough? pool: www process manager: static start time: ...
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1answer
210 views

Is it possible to bind a socket with NIC Queue?

when i open a new socket linex system automatically bind it to a NIC queu. Currently i have two sockets and i want to bind them to two different NIC queues. My question is 1)Is it possible to bind ...
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1answer
188 views

nginx handle multiple locations for one server

I need to setup a virtual host to run my users.example.com website. It needs PHP support via php-fpm. The ideia is to have a mapping like this: users.example.com/~user1/folder/file.php -> /home/user1/...
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2answers
4k views

Postfix & Amavis - Use UNIX Soket for Communication

I currently using a complex mailserver setup using Postfix, Dovecot, Amavis and Spamassassin. Everything works fine but I want to improve the Postfix-Amavis-Communication. At the moment, postfix will ...
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1answer
1k views

SELinux: no audit errors but nginx permission errors

I try to isolate a SELinux problem with nging/munin. I see that error message in "/var/log/nging/error.log": [crit] 8802#0: *55 connect() to unix:/var/run/munin/fcgi-html.sock failed (13: ...
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1answer
1k views

apache mod proxy_wstunnel invalid utf8 during websocket upgrade

I am experiencing an intermittent problem when connecting the jetty web-socket client to the server. The good people at Jetty assure me it is not a problem with Jetty. On the server side I have ...
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2answers
1k views

source address with iptables port forwarding

I set up port forwarding for port 80 with iptables: iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 10080 Additionally, I have ip forwarding enabled to route connections ...
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0answers
509 views

How to deploying Node.JS without interrupting service? [closed]

There are some blog posts and questions written about this, but they are mostly from 2010 or 2011, and I was hoping for a more up-to-date (2014 era) answer. I have a pretty standard Node.JS ...
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0answers
2k views

Deploying node.js application on Ubuntu VPS

I created an real time android application backed by a node.js application. I use express, socket.io, mongodb and ubuntu for my backend. But my problem is on how I can possibly run it in production or ...
4
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1answer
6k views

High # of sockets in TIME-WAIT state, server unresponsive at load

Our app became unresponsive at high loads, with longer wait times. Process usage was abnormally low (~15% CPU utilisation per process, our app runs on 8 processes). Nginx error log output showed a ...
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2answers
4k views

Using nginx to proxy multiple instances of sockets.io

I have two separate node.js applications running behind nginx. Both the apps use socket.io and express. One is served on port 5000 and the other on port 5001. But we need them both accessed through ...
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1answer
3k views

IIS Reverse proxy and websockets, failed websocket handshake

I am running a little website using IIS 7.5 on Windows Server 2008 R2. I've got a node.js application too running on port 3000. Http calls from the website (client browser) are reverse proxied from ...
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2answers
5k views

Check if a path exceeds maximum for Unix domain socket

Operating systems limit the length of a path of a Unix domain socket. How can I check whether a particular path is within that limit? Or, to put it another way, how can I check the maximum permitted ...
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1answer
4k views

Milter service needs transport:endpoint instead of “/var/run/opendkim/opendkim.sock”

I have set postfix with milter based on this tutorial: https://www.digitalocean.com/community/tutorials/how-to-install-and-configure-dkim-with-postfix-on-debian-wheezy But then posptfix reported that ...
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1answer
177 views

What better solution to adopt for client server system implementation by java sockets

I need some advice from someone experienced in networking. I have already created a system designed to monitor some tasks (5-30) that are written in java started by a auomatic scheduler or by ...
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1answer
3k views

nginx reverse proxy for websockets with SSL

I am trying to configure nginx (installed via macports) on my osx development machine. I am trying to reverse proxy localhost:12346/trade to a websocket connection which is available on port 12346 at /...
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3answers
949 views

understanding resolv.conf nameserver through system calls [closed]

I am trying to understand how /etc/resolv.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
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1answer
440 views

understanding resolve.conf nameserver through system calls [duplicate]

I am trying to understand how /etc/resolve.conf /etc/nsswitch.conf exactly works and what is significance of nameserver entry 127.0.1.1 I did strace ping google.com to get to know about the system ...
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1answer
2k views

Connect with Java to Amazon EC2 instances

I have written a client-server application in Java and I want to run it on Amazon EC2 Ubuntu instacnes. The client runs on an EC2 instance and the server on one and the third EC2 instance is for ...
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1answer
316 views

Trouble getting Unicorn to talk to Nginx

I've seen all of the other questions on here but none of them seem to work for me. Whenever I try and access my site I'm getting a connection refused error through the nginx logs. I'm assuming there ...
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1answer
2k views

How to monitor socket connection usage and exhaustion on a server?

I have a service endpoint (java) that will be getting bursts of thousands of requests per second. In my load testing I had to tweak the server because I would run out of open sockets as there were ...
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1answer
7k views

NGINX: How to proxy http(s) traffic to one server and ws(s) traffic to another?

I'm new to nginx and how it handles locatoins, and was hoping to get help for a problem I'm having: On the same server I have an Apache web server and a websocket server. Apache works on port 8080 ...
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2answers
12k views

Send Text String to a Socket In Windows

I have a server that has an open socket that listens for a particular text string on it in order to perform an action. Our linux machines send this data via: echo "text_string" | nc -w 2 server-...
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2answers
11k views

Configuring port in iptables for websockets

I'm implementing Ratchet's push example in my server (websockets) on port 9090. These are current iptables policies: [root@myserver ~]# iptables -L -n -v Chain INPUT (policy ACCEPT 309 packets, 22420 ...
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2answers
22k views

What does TCP: too many orphaned sockets mean?

When I use dmesg to look at linux kernel messages, I see a flood of.... TCP: too many orphaned sockets messages. My guess is this is sockets that are hanging around in TIME_WAIT after being closed ...
4
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0answers
807 views

Can nginx set 'Origin' header when proxing websocket?

We know nginx can proxy WebSocket since version 1.3.13, and we also know some times WebSocket server will valid the 'Origin' header, so someone said you can do something like: proxy_set_header Origin ...
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0answers
102 views

Single TCP-CLOSE_WAIT connection brings down application till restart

Recently found a behaviour where my application had a connection in TCP Close_wait state till the app was restarted (after about 5 hours). But during this period the SUnreclaim space was also ...
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2answers
355 views

When a socket switch to TIME_WAIT state, why I can't see its inode number?

I'm developing a program in python that parses /proc/net/tcp informations, but unfortunately, while I was doing this, I saw a strange thing. Practically, when a socket change in TIME_WAIT state, ...
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1answer
714 views

KVM unix socket file permission for VNC

I'm using kvm-qemu/libvirtd for a bunch of kvms. I'm using vnc for the graphical interface. By default, it listens on a tcp socket. I want to have it listen on a unix socket instead. Looking at some ...
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1answer
2k views

Rails application deployment, nginx, unicorn, capistrano socket error

I am deploying a rails application to a digital ocean VPS. I have followed https://coderwall.com/p/yz8cha . All things done well, but now the browser shows only a blank page. Nginx log contains: ...
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1answer
1k views

Can HAProxy reconnect a websocket to another backend server transparently?

I'm new to HAProxy so this might have an obvious answer but I wasn't able to find it. Consider this setup: two backend web applications; one HAProxy in front of the web applications; many clients ...
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3answers
4k views

Apache load balancer for mod_proxy_wstunnel?

We are in the process of developing a JavaEE 7 application to be deployed on JBoss/Wildfly that will make extensive use of Web Sockets. We're using mod_proxy_wstunnel for web socket support, and we'...
13
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1answer
29k views

Configuring Apache 2.4 mod_proxy_wstunnel for Socket.IO 1.0

I'm trying to configure Apache 2.4 for proxying the websocket connection for socket.io to a node.js websocket server, using mod_proxy_wstunnel. We had this working fine with socket.io 0.9, but with ...
3
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2answers
3k views

Directory for PHP 5 FPM socket files is deleted after reboot on Ubuntu Server

I've created a directory to store socket files for PHP 5 FPM: sudo mkdir /var/run/php-fpm. It is owned by root:root as well as core PHP FPM process. When PHP FPM is starting, it creates socket files ...
0
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1answer
256 views

Allow user to bind only certain ports on Linux [closed]

Welcome, I'm looking for equivalent of mac_portacl from FreeBSD. I want to assign to one user only certain ports. Filtering it by iptables isn't enough, because when process works, the port is blocked ...
1
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1answer
554 views

How do you control the file ownership of a socket managed by launchd

I'm working on writing a daemon that talks to other daemons in the same project over UNIX sockets. For security purposes, it's critical that these daemons only talk amongst themselves (and can't, for ...
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1answer
3k views

Updated php5-fpm, can't use socket anymore

Earlier today, I updated packages on one of my servers. One of those packages was an update to php5-fpm, which seems to have broken my ability to utilize unix:/var/run/php5-fpm.sock. Disclaimer: I ...
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1answer
2k views

Fixing WebSocket 404 Error With Dynamic WebSocket URL's Under Reverse Proxy

I am running Ubuntu, Apache, mod_proxy_wstunnel(Enabled), Shiny-Server, and R. I have setup shiny-server to listen locally, and Apache to Proxy requests for the shiny-server. I have also setup a basic ...
2
votes
1answer
9k views

Access to a network server without port forwarding

I have a network with the following structure. The server in PC2 is simple socket server TCP in 8080 port. I need to access to PC2 from other external network by socket client. This socket client ...
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2answers
4k views

Websocket & HTTP proxy with server between two firewalls

I have a server ("A") running behind a firewall, which serves HTTP and websockets. I have no control over the firewall, but do have an external server ("B") to which the internal server can connect (...
2
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1answer
8k views

How to solve SocketException: Permission denied: connect

I recently encountered a problem that is giving me a headache and I need help ... The System consists of two subsystems, called A and B, each running on a standalone Tomcat instance and currently ...
5
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1answer
4k views

SElinux label for php-fpm sockets

I'm attempting to set up multiple instances of php-fpm to run multiple versions of php through apache 2.2 running on centos 6.5. At some point in the future this will end up in a shared hosting ...
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0answers
357 views

Weird socket behavior in VirtualBox (NAT + PAT)?

I have a Linux VM with NAT and PAT configured. Let's say ports 2000 and 2001 are forwarded to the VM. These ports are also configured for external access on a device such as a router using a domain ...
1
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1answer
975 views

Increase number of connections per socket

How do I increase the number of connections each socket can accept? I know that you can increase the total number of connections using: # sysctl kern.ipc.somaxconn=4096 But each connection is then ...
5
votes
1answer
3k views

Create a link to the Unix socket [duplicate]

Is there a possibility to create a hard link for an unix socket? I'm creating a jail and symbolic links won't work, so I'm looking for a solution, how to provide an unix socket inside chrootted ...
1
vote
2answers
941 views

Communicating between two servers sitting behind their respective NATs

I'm building an web app (Server A) that communicates with a remote server (Server B) that is connected to the internet. Server B resides behind a NAT and is listening to communication on 3 non-...