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What is tcpip?

Tcpip.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the OS, hardware etc.
The free file information forum can help you determine if tcpip.sys belonging to the Windows system or an application you can trust.

Run a free scan to check for tcpip drivers in need of updating

Tcpip.sys file information

The process known as TCP/IP Protocol Driver or TCP/IP Driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).

Description: Tcpip.sys is an important part of Windows, but often causes problems. The file tcpip.sys is located in the folder C:\Windows\System32\drivers. Known file sizes on Windows 7/XP are 359,808 bytes (53% of all occurrences), 361,600 bytes and 6 more variants. http://www.file.net/process/tcpip.sys.html 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. It is a trustworthy file from Microsoft. tcpip.sys seems to be a compressed file. Therefore the technical security rating is 8% dangerous, however also read the users reviews.

Recommended: Identify tcpip.sys related errors

Important: Some malware disguises itself as tcpip.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the tcpip.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Deals with your internet connection. LAN i think.
modified by service pack 2 in xp pro to limit the amount of concurrent connections.
Controls the max number of TCP/IP connections that are allowed
The tcpip.SYS file in windows xp sp2 limits socket connections and prevents the creation of RAW TCP sockets, and prevetents any UDP type packets from leaving the stack that have ip addresses that arent present on a network adapter installed in the machine. This has been done to circumvent known threats by malatious code , and Networking tools.. .. Needless to say.. my sentiments on the new SP2 TCP/IP stack is very low. but to elate to the summary, yes, the tcpip.sys file is essential for a Windows based machine to use the tcp/ip protocals(ie use Networking or the Internet).
  Johnathon   (further information)
performing a "file signature verification" run, it pop up as a file as not microsoft digitally signed.
  Luis R.  
TCPIP.sys is used to access the whole IP protocol... Example, if you desactivate it, you won't be able to access the internet and your network because it can't initialize the protocol at windows startup. Tested it by manually setting the service to disabled on startup, in the registry.
W32.Downadup.B Modifies the tcpip.sys file. It also attempts to spread to network shares protected by weak passwords and blocks access to security-related Web sites.
  cingo   (further information)
not dangerous. modifled by SP2 to limit the conections.
  Siqd Kahul   (further information)
tcpip.sys is needed basically for using the internet. However, it is true in XP SP2 and above do limit the total connections per second you can use. It is possible to change it to more connections, however, it is recommended that if you are to do such a thing, you should research it more.
  Vladimir   (further information)
"TCP/IP Protocol Driver" = "c:\windows\system32\drivers\tcpip.sys" System ; Running ; ( 6: Unknown ) ; TCP/IP Protocol Driver ; Microsoft Corporation ;
it is not a dangerous file, you don't have to delete just tell your antivirus that it is a good file, look for some thing like exceptions and add the tcpip.sys file.
  Hollywood Henry  
appear in a blue page on boot_have noproblem on secon boot!
It crashes My Computer!
spybot gets rid of it
If it is missed it will cause dump but you can manually rooted to the folder and you can delete it and use any purchased version of antivirus it will take care for future problems i.e dump

Rating chart

Summary: Average user rating of tcpip.sys: based on 18 votes with 15 user comments.
10 users think tcpip.sys is essential for Windows or an installed application. 2 users think it's probably harmless. One user suspects danger. 5 users think tcpip.sys is dangerous and recommend removing it. 2 users don't grade tcpip.sys ("not sure about it").

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Tcpip scanner

Security Task Manager shows all running Windows tasks including embedded hidden functions (e.g. keyboard or browser monitoring, autostart entry). A unique security risk rating indicates the likelihood of the process being potential spyware, malware, keylogger or a Trojan.

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Other processes

tcpip.sys [all]