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September 30, 2009  1:06 PM

Where do TCP resets come from?



Posted by: Troy Tate
application performance, network analysis, network management, network monitoring, network performance, packet capture, performance analysis, protocol analysis, tcp, udp

I recently came across an excellent article on the topic of TCP resets. TCP is a connection-oriented protocol as opposed to the connectionless nature of UDP. So, if there are TCP resets on your network, this is not a bad thing and is just inherent in the protocol. Without TCP resets, a host could...

September 14, 2009  1:49 PM

Microsoft does not patch vulnerability for supported version of Windows



Posted by: Troy Tate
information security, Microsoft, Microsoft support, patches, risk, risk management, support, tcp, tcp-ip, tcp/ip, threat, vulnerability, Windows, windows 2000

Last week was the September issue of Microsoft "patch Tuesday". The September 2009 Microsoft Security Bulletin lists a number of vulnerabilities. Microsoft held the


April 29, 2009  12:11 PM

Doing Microsoft packet analysis? – Microsoft releases Network Monitor 3.3



Posted by: Troy Tate
analysis, analysis tools, Microsoft, network, network analysis, network monitor, packet analysis, packet capture, protocol analysis, tcp, tools, udp

If you do packet capture or analysis in a Microsoft environment, then you are probably already familiar with Microsoft Network Monitor. If not, please read my real-world use of it for


January 9, 2009  4:38 PM

PROTOCOL analysis vs protocol analysis (with a small p)



Posted by: Troy Tate
Microsoft, Microsoft Exchange, network monitor, OSI model, patches, protocol analysis, SMTP, tcp, wireshark

Recently we had an issue at a site where outbound messages larger than 1MB were backing up in the outbound message queue. The messages were tagged with a 421 4.4.2 Connection dropped error. This was a puzzling issue since the smart relay host was on the local LAN, and in fact, on...


January 6, 2009  4:45 PM

Swiss-army knife for public network testing



Posted by: Troy Tate
connectivity testing, crypto, crypto testing, cryptography, dns, hash, icmp, ping, public network, ssh, SSL, tcp, testing, toolkit, tools, tracert, typosquatting, udp, website

Sometimes it is necessary to test connectivity outside of your private company network. There are several resources I use. I will share a couple of those with you in this posting. One of my favorite and most frequently used sites is

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