If you use the Response.TransmitFile method in your ASP.NET pages, there is a good chance that the file being transmitted is locked and unavailable for writing during that operation. TransmitFile was introduced with .NET V2.0 and it's supposed to be a more optimized version of WriteFile. For months I had been dogged with exception alerts — Continue reading »
ASP.NET Denial of Service
📆 November 3, 2008
How to send your IIS server into a frenzy with one line of HTML code? I didn't think it was possible until a few days ago we were stung with a persistent denial of service at work. This is what the event log showed on every instance of outage: Event Type: WarningEvent Source: W3SVC-WPEvent Category: — Continue reading »
Yahoo Slurp Versus Googlebot
📆 July 19, 2008
As a part of my early morning routine at my job I scan a daily notification on our web site visitor patterns, specifically looking for abusive or abnormal page requests to identify rogue hosts. I wrote the program years ago, but it has become one of my most effective tools in identifying abuse. No surprise — Continue reading »
DNS Mystery, NameServers, IP addresses
📆 June 18, 2008
Today I was trying to reach 1&1's home page, but the browser kept failing to pull up the site. Mysteriously I was able to reach 1&1's home page when I changed my DNS servers to those of OpenDNS.org. Feeling curious I decided to investigate the matter in depth. My default DNS server was reporting the — Continue reading »
Yahoo's Fate After Microsoft
📆 May 4, 2008
While many are preparing for a dark day for Yahoo's share when the market opens on Monday, I don't think the shares will get battered too roughly, although there will be volatility. Microsoft's withdrawing of its offer isn't good news to many, but speculation on what Yahoo may have up its sleeve might keep the — Continue reading »
Yahoo's Fate After Microsoft
While many are preparing for a dark day for Yahoo's share when the market opens on Monday, I don't think the shares will get battered too roughly, although there will be volatility. Microsoft's withdrawing of its offer isn't good news to many, but speculation on what Yahoo may have up its sleeve might keep the — Continue reading »
Give a few Sats