TCP DupACKs and TCP Fast Retransmits

Hello all, my name is Mehul and I am with Platforms Networking support. We receive many calls dealing with slow file transfer when copying files using TCP (such as SMB file copying or FTP file transfer). The recommended approach to troubleshoot these scenarios is to take Network Monitor traces at the source and the destination…. Read more

New Networking-related KB articles for the week of February 21 – February 27

Here are the most recently published networking-related Knowledge Base articles for the week of February 21 through February 27: 979272 FIX: Communication over an IPsec connection is broken unexpectedly when a client reconnects to the IPsec server within four minutes after the client restarts 977336 You cannot migrate or import the Hyper-V role and the… Read more

Support for Windows 2000 and Windows XP SP2 will end on July 13, 2010

We want to get the word out about an upcoming deadline. On July 13, 2010 our support for Windows 2000 and Windows XP Service Pack 2 will end. In the case of Windows XP, Service Pack 3 will continue to be supported. More information about the end of Windows XP SP2 support can be found… Read more

How to migrate a DHCP database from Windows 2000 Server to Windows Server 2008 or Windows Server 2008 R2

A few months ago, I wrote a post on how to migrate a DHCP Server database from Windows 2000 to Windows Server 2008. As Windows Server 2008 R2 has since released, I wanted to update the information on this subject. The process has not changed in any way from my original post. I am publishing… Read more

SNMP Traps in Windows Server

What is an SNMP Trap? It’s nothing but an alert message with abstract information about an event sent from an SNMP agent to its configured SNMP manager. It notifies the administrators about an event that occurred in the SNMP agent. There is separate service called SNMP Trap service which runs in Microsoft operating systems and… Read more

Network connectivity issues post deployment of MS09-001? Try updating your Anti Virus Signature

One of our customers reported an issue after applying the update per KB958687 (MS09-001), which installs a new version of SRV.SYS. The customer was experiencing the following symptoms: Request Timed Out error when trying ping the problem machine from another machine. Unable to establish a remote desktop connection to the machine on which MS09-001 has… Read more

Ever wanted to quickly check to see if a server or group of servers were registered in WINS?

During the Windows 2000 beta, I worked with the WINS Development group to add the Verify Name Records option to the WINS server. In this post, I will give you a quick overview of how this works, so you can see how it will quickly answer questions in a time of name resolution trouble. Below… Read more

DNS name resolution issues after installation of Windows Update discussed in bulletin MS08-037

We have been hearing of an issue since the recent release of an update to address a DNS spoofing vulnerability, MS08-037, discussed in KB951748.  After application of the update, affected systems can experience problems with applications that rely on DNS name resolution.  For example, a user on an affected system would not be able to… Read more