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What can be the reasons of connection refused errors?
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If you try to open a TCP connection to another host and see the error "Connection refused," it means that
You sent a TCP SYN packet to the other host.
Then you received a TCP RST packet in reply.
RST is a bit on the TCP packet which indicate...
How to close TCP and UDP ports via windows command line
Does somebody knows how to close a TCP or UDP socket for a single connection via windows command line?
17 Answers
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Checking network connection
...p (0.0048s latency).
Not shown: 999 filtered ports
PORT STATE SERVICE
53/tcp open domain
Nmap done: 1 IP address (1 host up) scanned in 23.81 seconds
As we can see, 53/tcp is open and non-filtered. If you are a non-root user, remember to use sudo or the -Pn argument for Nmap to send crafted pro...
Open firewall port on CentOS 7
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In the case of public try:
firewall-cmd --zone=public --add-port=2888/tcp --permanent
Then remember to reload the firewall for changes to take effect.
firewall-cmd --reload
Otherwise, substitute public for your zone, for example, if your zone is dmz:
firewall-cmd --zone=dmz --add-port=288...
How to kill a process on a port on ubuntu
...? If Linux specific then, even this command works os.system("fuser -k 8080/tcp");
– Ridhuvarshan
Jul 25 '18 at 12:04
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Thin web server: `start_tcp_server': no acceptor (RuntimeError) after git branch checkout
... port 3000 may already be in use. Look at http://mrjaba.posterous.com/starttcpserver-no-acceptor-runtimeerror
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What does “connection reset by peer” mean?
What is the meaning of the "connection reset by peer" error on a TCP connection? Is it a fatal error or just a notification or related to the network failure?
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RabbitMQ and relationship between channel and connection
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A Connection represents a real TCP connection to the message broker, whereas a Channel is a virtual connection (AMQP connection) inside it. This way you can use as many (virtual) connections as you want inside your application without overloading the broke...
Determine the process pid listening on a certain port
... This also includes processes that are connected on that port. lsof -i4TCP:80 -sTCP:LISTEN -t is probably what you want, instead.
– Nevir
Mar 26 '16 at 21:18
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How to create a simple proxy in C#?
...ther browser in the world will work.)
What you need to do is:
Listen a TCP port
Parse the browser request
Extract Host connect to that host in TCP level
Forward everything back and forth unless you want to add custom headers etc.
I wrote 2 different HTTP proxies in .NET with different requir...