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Questions tagged [sockets]

A communication end-point for networking, for CPUs please use [processor-socket]

270 questions
225
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7 answers

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. Anything that opens a socket and listens is high…
jww
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145
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15 answers

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 the application which owns the connected socket…
codingfreak
119
votes
2 answers

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 proxy in place? I'm imagining something like…
Hubro
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90
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5 answers

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 cannot seem to find a solution for local unix…
ck_
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67
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2 answers

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?
Samuel Alexander
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43
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3 answers

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 /tmp/fifo srwxrwxrwx 1 root root 0 Nov 8 15:54…
anishsane
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34
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6 answers

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 was up (connected)? (No, I don't have access to…
hidralisk
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22
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1 answer

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 X)? I'd imagine something like a good old…
Mike L.
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19
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3 answers

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 accessible via http://x.x.x.x:8200/ and…
David
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19
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1 answer

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/stats Which is very ugly in the output. Columns…
nelaaro
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14
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3 answers

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, it does not show up in netstat/TCPview, but does…
Jan Schejbal
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14
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3 answers

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 specification about how this works on…
Simone
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13
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1 answer

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-recommended software that I've tried to look for “pid that…
Captain Trojan
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13
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1 answer

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 file from inside a container to the host file system.…
Torque
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13
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2 answers

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?
kimo pryvt
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