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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62 views

IP address differences between two computers on the same local network [closed]

Why does the python command print(socket.gethostbyname(socket.gethostname())) give: 192.168.1.4 on my laptop 127.0.1.1 on my Raspberry PI when they're both on the same local network, and the PI's IP ...
0
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1answer
56 views

127/8 address is not passed to IP stack?

I send IP/UDP frames using raw sockets with destination IP address from 127/8 range - e.g. 127.0.0.6. So, packets are sent over the network OK (checked using tcpdump on the target device). But on ...
0
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0answers
12 views

Route only on output chain?

I have two machines A and B. I want to send iperf traffic from A to B, but first have it route through a userspace program on A. I did this with a tunneling device: therefore, I used the command ip ...
0
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0answers
93 views

SYN/ACK not received by iperf client?

I have an application that essentially consists of four components A, B, C, D. A and B are on the same machine - B and C are separate machines. Traffic is generated by an iperf client on A with a ...
2
votes
1answer
504 views

sudo: unable to create sockets: Cannot allocate memory

On a VPS run by OVH (apparently OpenVZ-based, given /proc/user_beancounters exists), with relatively few processes running, trying to sudo gives me the error in the title. Here is a sample ...
1
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1answer
164 views

icinga2 mysql connection issue

I followed all the install wizards When setting up icinga2, I have the following error: SQLSTATE[HY000] [2002] Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (13) ...
0
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2answers
233 views

Redirect subdomains to services on different ports of same server

I have a VPS which has 1 IP. If I run two socket servers, one on port 8080 and the other on port 8081, is there a way I can map service1.mydomain.com to the socket server on port 8080 and ...
0
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1answer
3k views

dnsmasq: failed to create listening socket for port 53: Address already in use

I got this error when i done the setup dnsmasq. ashokkrishna@krishna:~$ sudo dnsmasq dnsmasq: failed to create listening socket for port 53: Address already in use ashokkrishna@krishna:~$ netstat ...
0
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0answers
83 views

FTP Server error, A receive socket error occurred

I have a FTP server, Core FTP server, where i get errors for inbound transfers to one of the accounts. The inbound files are only 1k in size. The error occures in 5% of all inbound transfers. Error ...
0
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1answer
132 views

How to use non-deprecated tools like ss to get process id running on a port?

I am looking for a non-deprecated way of running a command like netstat -tulpn | grep 8000 to output information about an active port. Any suggestions on how to use a tool like ss to get the process ...
0
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0answers
28 views

What are the minimum permissions for a libpam-ldap unix domain socket?

I'm setting up an LDAP server and libpam-ldap to run on the same host, communicating via a UNIX domain socket. I'd like to give this socket the minimum permissions necessary, so random local users ...
0
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2answers
2k views

HAProxy max session limit

I have an Amazon OpsWorks stack running HAProxy (balance = source) and several node.js instances running socket.io. It seems HAProxy determines the max session limit for a given instance based on the ...
0
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0answers
123 views

wsgi nginx error: permission denied while connecting to upstream

There seem to be a few questions on stackoverflow and serverfault about this but unfortunately nothing has worked for me. I'm getting a 502 bad gateway on nginx, and the following on the logs: ...
3
votes
1answer
841 views

Nmap external scan shows port open, ASA says port is not open, but do get an socket

Folks, have a weird one, need your expert help. For one of our heavily used external facing server which came up in an audit, nmap -Pn scan shows the following: Starting Nmap 5.51 ... Host ...
2
votes
2answers
693 views

nginx - why i can't use variables in proxy_pass path?

Why i can't use variable $user in proxy_pass - like in example below? server { listen 80; server_name ~^(?P<user>[a-z|A-Z|0-9|_|-]+)\.example\.net$; root /home/$user/webapps/; ...
5
votes
2answers
3k views

Siege: descriptor table full sock.c:119: Too many open files

I am trying to make a stress test in my own server using siege with the following command: $ siege -c 500 myweb.com/somefile.php But I get this error: [error] descriptor table full sock.c:119: Too ...
1
vote
0answers
144 views

After sending Duplicate ack by the server, it stop responding [closed]

My TCP client communicates with multiple 3rd TCP servers. However one particular server produces duplicate ack and stop responding in the specific time only. That particular server is OK other time. I ...
0
votes
1answer
5k views

node.js, socket.io only working on localhost, can't access from intranet

I am using node.js and socket.io for the real time notification system. I have tested node.js and socket.io with simple chat code, it pretty good with localhost but can't access the same from the ...
0
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2answers
2k views

How to let PHP connect to database by using UNIX socket (Joomla)

I'd like to have my PHP applications such as Joomla make use of the UNIX socket to connect to the local mysql database. I've already configured the php.ini with: mysqli.default_socket = ...
0
votes
1answer
143 views

How to work whit socket_file httpd (nginx-uwsgi)

I am trying to run Nginx/uWSGI/Django, the last remaining step is to run the socket_file all I get is a 502 Bad Gateway. Route my django application. #/home/deploy/webapps/myapp Configuration ...
5
votes
1answer
1k views

WebRTC on standalone asterisk - no audio

After struggling with Asterisk for WebRTC for a few weeks now, I decided to put my problem on this forum. My Problem is as follows: Im not getting audio from WebRTC to WebRTC clients. I work in a LAN ...
0
votes
1answer
553 views

Can't boot Mysql on Centos 7

I've installed mysql on Centos 7 (mysql-community-server) as root. The problem is that I can't start the daemon with "service mysqld start", It never return me to prompt and even if I try to use ...
0
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0answers
246 views

Yet another “Can't connect to local MySQL server through socket” after a security update

SOLVED As yoonix pointed out, it was only an issue with the root partition being full... Thanks for your help! - So yes, this question has been asked several times, here and elsewhere. I apologize ...
0
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1answer
352 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 ...
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0answers
435 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
votes
2answers
187 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 ...
0
votes
1answer
57 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 ...
2
votes
1answer
129 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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votes
1answer
49 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 ...
0
votes
1answer
92 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 -> ...
2
votes
2answers
1k 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 ...
2
votes
1answer
957 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: ...
0
votes
1answer
626 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 ...
3
votes
2answers
348 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 ...
2
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0answers
314 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 ...
0
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0answers
217 views

How do I know the remaining buffer space?

There is a socket error 10055, meaning "No buffer space available". But what is this buffer space and how do I know, how much of it is still available? At the time I've got this error, the server had ...
1
vote
1answer
945 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 ...
3
votes
1answer
2k 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 ...
1
vote
2answers
704 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 ...
0
votes
1answer
1k 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 ...
5
votes
2answers
2k 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 ...
1
vote
1answer
1k 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 ...
0
votes
1answer
141 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 ...
0
votes
1answer
1k 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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votes
3answers
466 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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votes
1answer
156 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 ...
0
votes
1answer
543 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 ...
0
votes
1answer
180 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 ...
0
votes
1answer
543 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 ...
1
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1answer
3k 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 ...