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 operating system, hardware etc. The free file information forum can help you determine if tcpip.sys is a Windows system file or if it belongs to an application that 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 or Betriebssystem Microsoft Windows by Microsoft (

Description: Tcpip.sys is an important part of Windows, but often causes problems. The file tcpip.sys is located in the C:\Windows\System32\drivers folder. Known file sizes on Windows 10/8/7/XP are 361,600 bytes (72% of all occurrences), 360,064 bytes and 4 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs. The program is not visible. It is not a Windows system file. tcpip.sys appears to be a compressed file. Therefore the technical security rating is 15% dangerous, however you should also read the user 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
On several occasions after a microsoft update requiring reboot/s Windows 7 SP1 won't load & the Windows Start Up reports the problem is TCPIP.SYS

Rating chart

Summary: Average user rating of tcpip.sys: based on 21 votes with 16 user comments. 12 users think tcpip.sys is essential for Windows or an installed application. 2 users think it's probably harmless. 2 users suspect 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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Best practices for resolving tcpip issues

A clean and tidy computer is the key requirement for avoiding problems with tcpip. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the tcpip.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

tcpip.sys [all]