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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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What packet to ignore to not have ssh terminated on brief connectivity loss?

It seems like sometimes there are some connectivity problems around the edge of our network to certain other networks, and my ssh sessions with some remote servers, which themselves have no connectivity issues, drop. Remotely, the sessions still…
cnst
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Several Server Errors (No database connect, can't create TCP/IP socket etc

My server stops taking requests on my website today. It works for some time, but then the server just stops working and throws several errors: 500 Internal Server Error Warning: mysql_connect(): Can't create TCP/IP socket (105) in [...] on line 7…
Tobias Baumeister
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TCP packets larger than 4 KB don't get a reply from Linux

I'm running Linux 3.2.51 in a virtual machine (192.168.33.15). I'm sending Ethernet frames to it. I'm writing custom software trying to emulate a TCP peer, the other peer is Linux running in the virtual machine guest. I've noticed that TCP packets…
pts
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No ssh connection to vServer possible; numtcpsock value is 1,024

my virtual server is used as a mailserver (with Zimbra 7.2.0_GA_2669) and webserver. Yesterday the Zimbra web interface was not accessible anymore, though all services were running. Since two hours, the whole server cannot be accessed anymore. Not…
user2092982
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Tunneling ports through different routes without the knowing of the local programs

I need to set up the following scheme: server1: Generic program connects locally to proxy, which then connects to proxy to server2. Everything is ok, until the connection between the servers. When the connection is down OR some other event…
neoX
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Unable to POST/Upload files to a PHP page

I have a weird problem when I try to post contents or upload files by php to my server. After submitting the form it sleeps for a while then shows a page loading error. I tried different contents and files with different sizes and found that it only…
Ahmad
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Information about SYN

I'm new to socket programming and i read that SYN packet can be created through a raw socket .But windows api doesn't allow the creation of a raw socket .I know that ICMP packet doesn't have any port binding to it and where as TCP SYN has a port…
blitz
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Port 1227 for a web form

A Panamanian government website has a form that is on port 1227. 1227 is used for network administration (DNS). Like most good companies, we blocks most non-standard ports, and before we open them we want to ensure that our network won't be…
marcwenger
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How to increase nginx connections

I am facing the problem of nginx max connection issues. I am not able to increase max active connections(520) made by nginx. Some time it is using whole writing (516) operation connections. and due to this other requests are all pending. Does…
Vikas
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Route TCP responses (ACK) through another interface

For reasons I can't go into, I am working with a strange network configuration. I have a one-way higher speed wireless link, and a slower bi-directional wireless link. There is a network interface for each link (currently only UDP works on the one…
Derek
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syslog-ng 2.0.9 closing tcp connections from some clients instantly..?

I've a syslog-ng instance on 2.0.9, which is old, but... this is enterprise IT and upgrading the versions is... fun... running on Solaris 10. I have this strange problem where some clients stop being able to stay connected to the server on TCP. When…
Chris Phillips
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Newbie, need help deciphering firewall log files (Cisco ASA 5520)

I'm not very familiar with firewall log files, or many of the terms involved in server connections. The lines in question involve a foreign, unauthorized IP interacting with a firewall (Cisco ASA 5520) over several months. What generally do the…
user177033
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TCP application accessible remotely but not locally

I am trying to help a friend figure this out, so I don't know all the details, but I figured I would post on here to see any possibilities. We have a custom application that communicates using a single TCP port between the client and server and want…
Kyle
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Minimal handshaking necessary before establishing TCP connection

I have a Windows PC that is running a TCP server on port 9000. I also have an FPGA which is directly connected to the PC via a 10G port. The FPGA can send ethernet frames to establish and maintain a TCP connection with the server, and that's it.…
Randomblue
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svnserve -d child process spawning and svn connections under netstat

I see many svnserve -d processes running on my CentOS 6 box, one with the PID 400 and PPID 1 and the rest with PPID 400. I take this to mean the first one is started by init scripts (i know it is) and the rest are child processes of the original…
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