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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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Concurrent TCP connections on Azure can be upto 500K. Really?

Let me be very clear at the outset that I am new to cloud technology. All I know is cloud servers are easily scalable (i.e. adding physical hardware is transparent to applications and users) and unlike in older days application don't need to worry…
Atul
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NetTcpPortSharing process won't start on Windows Server 2012 R2

I have a problem in Windows Server 2012 R2 : I have searched and try everything I know to fix this, but I cannot start NetTcpPortSharing service and therefore I cannot configure Windows Server Essentials Role, among other things. I have theses…
user3645663
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Bad ping results while testing 6000 TCP clients with 18 mbytes/s total traffic on Windows Web Server 2008

The clients are running on the machine #1. The server is installed on the machine #2. The machines have a gigabit connection through a switch on their private vlan. There are no errors in the switch log. The clients and ping command use internal IP…
Vlad
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Get a website's host machine's OS/server software without access to the server

Is there a good methodology to find the operating system and server software that is being used on a served website that you don't have SSH access to? What I'm doing right now is looking at TCP/IP headers in a browser development window. Also,…
smilebomb
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Strange entry in open file list on Ubuntu server

On my Ubuntu server I occasionally run the following command to view any open files that are TCP connections from my server: lsof -uroot | grep 104.236.XX.XXX The last time I ran it, I saw this as one of the entries: sshd 15651 root 3u …
flyingL123
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What does the tcp_fastretrans_alert error mean?

I found this error a couple of times in /var/log/messages after experiencing some odd TCP behavior: For some reason, if I connect to for example SSH for the first time in say an hour, the connection is dropped by the server. I tried doing a Google…
Elite_Dragon1337
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How many concurrent TCP connections are supported in Windows Server OSs?

I am distributing software in the form of a Windows service that can be installed, and am currently trying to ascertain the specifications for supported operating systems. The service communicates with a number of clients (using our client software)…
Raiden616
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how to force linux to accept packet with loopback ip

i have an embedded system with an Ethernet interface that needs to accept external packets with IP of 127.x.x.xx. is there a way to force Linux to accept external packets with this loop back address and to treat the packets as "normal" IP…
mark
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Proxy-attack simulation

I have a WS2008 x64 server, that has NodeJS application working on its 80 port. Server constantly receives queries from different IP-addresses that are trying to use my application as a proxy. NodeJS (working with Express module) is replying with…
Aleksandr
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Display IP & TCP statistics per interface (netstat -s with interface)

Linux has the ability to display protocol statistics with netstat -s. The output looks something like: Excerpt: 7487 times unabled to send RST due to no memory TCPDSACKIgnoredOld: 817 TCPDSACKIgnoredNoUndo: 7246527 TCPSpuriousRTOs:…
data
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windows firewall , some ports not listening

I've added an inbound connection rule for my windows 8 firewall on windows server 2012: I've restarted the Windows Firewall. When I check that port using this program, it says that it is not listening! What am I doing wrong? How do I enable…
Alex Gordon
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Solaris 11 / OpenSolaris - stop processes from listening?

I would like to write a script to secure Solaris 11 servers in preparation for internet access. In addition to enabling ipfilter, I would like to disable network-accessible services that are not used. This should reduce the number of processes shown…
700 Software
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Windows Server 2003 TCP port mapping / port forwarding

I've recently had an issue with the ISP of a few of my clients in which they've blocked TCP port 25 and de-commissioned their old mail server in lieu of Gmail. Also, our business email has been hosted on Google Apps now for well over a year. This…
Justin Bowers
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TCP Load balancing

I need to implement an architecture that can serve 3 million GPS Devices sending Location Updates/Alerts (every 10 secs) to our system for processing. Features: 1) TCP communication. 1) Long lived connections(~12 hrs a day). Change only when their…
gladiator
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How does an IP address goes down from an Application Layer to IP Layer?

Using the classical TCP/IP layers model, I am thinking about an application (for example a browser) acting as a client wanting to talk with a server (e.g. a web server). Of course it has to use the server's IP address to locate the server host in…
Giancarlo Perlo
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