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You have reached 2signals, written by Derek Hatchard and Jordan Lutes. We are software developers and business owners / entrepreneurs talking about what is happening in the software industry and on the Internet.

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Jordan is a software consultant and entrepreneur. Derek is the senior solution architect at ArdentDev.com, a mentoring and consulting company. Derek is also a Microsoft Regional Director.

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This blog has moved to www.derekhat.com.

Wednesday, May 10, 2006

.Net Web Farming

An issue that when we ran into while trying to cluster 2 Asp.net boxes:

When a given session changed between boxes, the

[HttpException (0x80004005): Unable to validate data.]
System.Web.Configuration.MachineKey.GetDecodedData (Byte[] buf,
Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) +195
System.Web.UI.LosFormatter.Deserialize(String input) +60

This occurred when the second machine was attempting to decrypt the viewstate created by the first.  Since  machine key used in the encryption/decryption process is not the same on both boxes, it fails.  To fix this issue, add a machinekey tag to the system.web section of the web.config on both machines.  To generate a proper machinekey tag, use the following utility: 

http://www.aspnetresources.com/tools/keycreator.aspx

Posted by jordan lutes 5/10/2006 1:54:03 AM (GMT Standard Time, UTC+00:00)
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