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Questions tagged [tcp]

TCP stands for Transmission Control Protocol and is one of the core protocols of the Internet Protocol Suite. TCP complements the Internet Protocol (IP), and therefore the entire suite is commonly referred to as TCP/IP.

TCP is just one communications protocol on the web. Others include:

  • User Datagram Protocol (UDP)
  • Internet Control Message Protocol (ICMP)
  • Hypertext Transfer Protocol (HTTP)
  • Post Office Protocol (POP3)
  • File Transfer Protocol (FTP)
  • Internet Message Access Protocol (IMAP)

TCP on Wikipedia

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syslog-ng: How to reduce high latency when forwarding logs to a syslog tcp consumer?

UPDATE 2: I've answered this via my new question at the link below. The root cause is behaviour by telegraf where by default it disconnects the TCP connection 5 seconds after the last received message. This may be by design, however I have an issue…
davidA
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netcat no reaction to syn packet crafted with gopacket

I want to do some experiments with TCP packets. Therefore I am using the gopacket (v1.1.19) to craft packets and send them onto an interface. I have this code for creating a SYN packet and putting it on loopback and sending to 127.0.0.1:8888 where I…
jonathan-dev
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So many TCP packets to domain server from domain clients

I have Windows Server 2012 R2 which controls my LAN. Everything was working fine (Shared Folders, Folder Redirection and so on) for a two months. But suddenly, there occured delay on communication between client computers and the server. When I look…
Gamer In The Game
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Strange TCP sequence from a device

I'm debugging strange connection reset problem in Java and got the next Wireshark capture: What can be the cause of repeating that ACK? I'm sure that the device received data correctly as it is executing the command that was sent. But it does not…
Vasyl Danyliuk
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How to make bind force clients to connect via TCP only?

I want to set up an experimental nameserver that asks clients to send requests via TCP only by sending back packets with the TC bit set. For that purpose I tried to work with the rate-limit parameter in the named.conf.options file but I couldnt make…
Mnemosyne
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How to toubleshoot port blocking issue

I'm forwarding port 80 of a web server to the public interface of the firewall, which is then mapped to a domain name so that the server can be accessible from that domain name. I did this process too many times but this time I'm in a different…
Menas
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ERR_CONNECTION_RESET When Using HTTPS Hosted by IIS 10 and Windows Server 2019

I have a site hosted in IIS 10 on a server running Windows Server 2019. I've set up an HTTPS certificate with Let's Encrypt. Attempts to view the site with http:// work normally, but when I enter https://, I get an ERR_CONNECTION_RESET error in…
user1325179
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Can someone explain what those incrementing ports after 127.0.0.1:XXXXXX are

I stumbled upon a strange looking incrementing port-number right after my loopback ip when using the PHP development server, that i am unfamiliar of and can't really find information on the web about it. $ php -S 127.0.0.1:3000 which logs requests…
wavedeck
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TCP Handshake and TCP RTT when using VPN

From my server I'm measuring the TCP RTT and I was wondering what would be the difference between clients that use VPN compared to non-VPN clients. So in the case of a non-VPN client the TCP session is established directly with the customer, which…
Vasilis
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Allowing IP & Port specific traffic for card terminal

I hope you can help me :) I am setting up a credit card terminal in my store network. (It‘s just a mobile LTE Router with a static IP address and a switch) The payment processing provider requires me to allow traffic to their specific IP adresses…
maxig
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TCP Window Full / Zero Window probe in CentOS 5.4 behind a Squid proxy

A friend's fresh install of CentOS 5.4 is misbehaving behind his university's proxy. If he takes the machine home and connects it directly to the internet, it works fine. If he installs some other OS (even an older version of CentOS) on the machine,…
Asad R.
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How to create TCP proxy that supports multiple hosts?

I would like to create a TCP proxy that supports multiple hosts. The example I saw was where a DNS server was used to point a specific host to a TCP proxy which had the host hardcoded in it. The TCP proxy can not handle multiple hosts because if all…
comctimert
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SQL server connection TCP/IP overt Ethernet

I have two PCs. There is SQL Express installed on one of them. TCP/IP settins are here: tcp/ip settings tcp/ip settings When I perform Test-NetConnection on local computer I get But when I do it from remote PC I get As you can see tcp succeeds…
user3742046
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TCP connections retains even sessions terminates

We have client/server application running in our environment, we are experiencing an issue that single client having multiple connections to the server, although, there is only one instance is running on the client machine. We have server running…
Suleman khan
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When Netfilter performes filtering in TCP/IP kernel network stack?

I have a question about where the Netfilter is placed in the network stack in the Linux kernel. I know that it is Network layer, netfilter and then TCP layer. In fact, after decapsulating the packet in IP layer in the kernel, it will be parsed by…
sarah sh
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