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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

1636 questions
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Socket(TCPIP) Unstable

I have a setup of a SCPI server in a Win7 PC and have 2 other programs talking to it locally(127.0.0.1) over TCPIP socket 5025 and 5029. This worked well and stable in a fresh PC, but when we moved it into our production lines and the IT dept added…
Lee Kwan Wee
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TCP handshake ok, then the client isn't receiving any packets from the server

Topology: Client ----- Intermediate Device ----- Server Client: win7 Intermediate Device: unknown Server: CentOS 5.8 The problem occurs when the client and server are trying to establish a SSL connection. It happens to one specific port, 2000. I…
xiaofeng.li
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TCP Port prioritizing on switch/router (QoS)

I have some HP ProCurve series Switch. There is a QoS option for prioritize traffic by TCP/UDP port. I set two ports: one with highest priority and another with lowest. Then I performed tests to ensure that prioritizing really works. I run two…
anth
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TCP Window Scaling. TCP scale factor not supported due to dynamic TCP Frame Size on windows 2008 server

PROBLEM Calling an asp webservice hosted by an ISP from our WCF service hosted on Windows 2008 Server is showing timeout/no response from webservice. DIAGNOSIS Using windows network monitor to packet capture and isolate packets sent a webservice…
scott_lotus
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TCP firewall allows connection to external server but blocks response packets?

Consider this basic network setup: Client -> Router -> "Internet" -> Router -> Server Problem: the client can open a connection to the server and send data ("request"), but the server data packets ("response") can not be sent to the client. It looks…
mjn
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TCP sender and receiver window issues

I just want to clarify some things. Lets say the receiver advertises a window of 2000 bytes. The sender sends a 1500 bytes and receives an ack from receiver with window size 100. The ack does not acknowledge the 1500 bytes sent. What will the sender…
Bruce
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Windows XP TCP halts after burst on ZMQ channel

I have a ZMQ application the sends a high rate of data over a TCP connection upon start up. The application runs fine on Windows 7 and Server 2003, but on XP it halts shortly after connection. The app is fine, just the connection seems to be…
JeffV
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Very strange localhost connections on linux workstation. Need help identifiying the source

The following is the output of netstat on a Ubuntu machine. Can someone help decrypt the output? I am especially curious what the ::1:43213 connection is. Also, why are there so many connections from localhost to localhost on both v4 and v6…
Max Brown
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fast opening and closing connection with a specific port

We have a Main application named "Trevor" installed in 2008R2 machine named "TEAMER12" which is slow now. One more application named "TVS" also running in and found there were many connections per second occurring to port 5009. netstat tool…
michale
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Why does Nexenta seem to ignore my /etc/system settings?

I am trying to tune my NFS performance, but for some reason nexenta is ignoring whatever I specify in /etc/system. In the following screen shot it becomes apparent that my manual settings are not being picked up, why? I realize the web gui does give…
cmaduro
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Windows 2008 Server ignoring LDAP request

I'm using Windows Server 2008 R2 and Windows NIC teaming. This is an HP server. Firewall disabled. I have 1 application which authenticates via LDAP to AD (TCP 389). (App is located in same VLAN) LDAP authentication from my app to AD is failing…
californian
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TCP what's the purpose of the third step of 3-way-handshake

Possible Duplicate: Why is it 3-way-handshake and not more? Example: If a client wants to talk to a server, it just tells the server that it wants to establish a connection, then the server confirms. People say that the third step's there so as…
IcySnow
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Linux Routing Problem

For a driver test I'm working on, I need to connect 2 Linux machines through a third Linux machine which acts as a router. Each machine has a proprietary network device with 2 ports so that one port is under subnet 11.x.x.x, and the second under…
Avihu Turzion
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Local Area Network (LAN) communication protocol

I'm a bit confused, and was wondering if someone can set me straight. Under a Local Area Network (LAN), what is the communication protocol for the data packets under i.e. ethernet CAT5 cable that seems to be the common practice. Is it TCP/IP? But if…
O_O
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How to reduce the number of time wait connections

I'm running comet server on linux (Debian). All the connections are proxied by nginx. And my time_wait/established rate is too big (50k/15k) although I set reuse_connections. I'd like to reduce this huge amount of unneeded connections in time_wait…
tsds
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