For the first time I was trying to debug my silverlight application projects on Windows vista. Every time I was trying to load test page of my web application, i kept getting Error 2104, telling me that download of silverlight application is failing. For a moment I thought it may be settings in my browser that are preventing download of this silverlight application. I could not find anything strict in my settings that will prevent the download. Then i stsrtaed digging around and found that silverlight application has new file extension type ".xap" and its a new mime type as well. So I added a new entry in MIME types in IIS and there you go. It worked like a charm. Just add the following entries and you will be all set.

File Extension: .xap

Mime Type: application/x-silverlight-app

I was working on a custom control for silverlight. I was using Visual Studio designer to layout some controls on the page. All of a sudden i started getting AG_E_UNKNOWN_ERROR in XAML pane. I could not find anything wrong with any mark up or any attributes. I tried to remove and add some of the controls on the page. I then noticed that it was following a pattern. I was getting this error when adding a TextBox control on the page. And it was very consistent. After thinking about it I recalled that I was getting error for controls where I had added x:Name attribute to the control. I recalled when I was using Beta version of Silverlight 2, I used to get some errors in XAML for no reason. Looks like that problem has not gone away in release version on silverlight.

The way I got rid of this AG_E_UNKNOWN_ERROR was by closing project in Visual Studio and then reopen. And it works :-)

I have been using CISCO VPN client to connect on Windows Vista to my work for more than a year. All of a sudden I started getting following error.

I searched around to find cause and solution to this problem. It seems that a lot of people have come across this issue on Windows Vista at some point or the other. There are different solutions provided for this problem but it looks that there is no one silver bullet that kills this error. I went through process of trial and error with different solution. And found that there is one solution works most of the time.

• Open list of your Network connections from control panel
• Set the connection for VPN to Disable state.
• Now connect with VPN client.