Windows 95 Stops Responding Because of Land AttackLast reviewed: March 10, 1998Article ID: Q177539 |
The information in this article applies to:
SYMPTOMSAfter receiving spoofed connection request (SYN) packets over TCP/IP, a computer running Windows 95 may begin to operate slowly. After about one minute, Windows returns to normal operation. This problem may occur with TCP/IP on other operating systems as well.
CAUSEThis behavior occurs due to "Land Attack." Land Attack sends SYN packets with the same source and destination IP addresses and the same source and destination ports to a host computer. This makes it appear as if the host computer sent the packets to itself. Windows 95 operates more slowly while the host computer tries to respond to itself.
RESOLUTION
Without WinSock 2.0 UpdateThis issue is resolved by the following updated file for Windows 95 and Windows 95 OEM Service Release 2 (OSR2) without the WinSock 2.0 update only:
Vtcp.386 version 4.00.956 (dated 11/26/97) and laterTo install this update, follow these steps:
~ Vtcpup11.exe (size: 155264 bytes)For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q119591 TITLE : How to Obtain Microsoft Support Files from Online ServicesThe following files are installed by Vtcpup11.exe:
File name Version Date/Time Size Destination folder ---------------------------------------------------------------------- Vtcp.386 4.00.956 11/26/97 9:56a 47,413 Windows\System With WinSock 2.0 UpdateThis issue is resolved by the following updated file for Windows 95 and Windows 95 OEM Service Release 2 with the Winsock 2 update only:
Vtcp.386 version 4.00.1424 (dated 12/10/97) and laterTo install this update, follow these steps:
~ Vtcpup20.exe (size: 158384 bytes)For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q119591 TITLE : How to Obtain Microsoft Support Files from Online ServicesThe following files are installed by Vtcpup20.exe:
File name Version Date/Time Size Destination folder --------------------------------------------------------------------- VTCP.386 4.00.1424 12/10/97 2:24p 52,133 Windows\SYSTEM Identifying the Winsock 2.0 updateFor information about how to determine whether the Winsock 2.0 update has been installed an a computer running Windows 95, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q177719 TITLE : Identifying Windows Sockets 2 Run-Time Components for Windows 95 STATUSMicrosoft has confirmed this to be a problem in Microsoft Windows 95 and OEM Service Release 2 (OSR2). An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for more information.
MORE INFORMATIONFor additional information about this issue as it applies to Microsoft Windows NT, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q165005 TITLE : Windows NT Slows Down Because of Land AttackFor additional information about issues resolved by updates to this component, please see the following articles in the Microsoft Knowledge Base:
ARTICLE-ID: Q170791 TITLE : Windows 95 TCP Clients Run Out of Ports ARTICLE-ID: Q168747 TITLE : Update to Windows 95 TCP/IP to Address Out-of-Band Issue |
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