Internet Information Services
Microsoft web server software.
1,637 questions
Error occurred during a cryptographic operation
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Chan Kok Kuen
1
Reputation point
Hi,
I'm currently facing this "Error occurred during a cryptographic operation" error on one of the production server.
I have the same application running on another server for the past 10 years, and never encounter the same issue.
Whenever this error occurred, I can make a quick fix by restarting the IIS server, and after the IIS restarted, everything will be back to normal.
But eventually it will happen again after a few hours later, it also happened to be running smoothly without hitting this error for the whole day.
I have tried by adding fix Machine Keys and Validation Method in the web.config, but it seems doesn't work for my situation.
Aside from this cryptographic error, I also noticed that there is a large amount of "The keyset is not defined." and "Invalid viewstate." error from the application log.
Appreciated if I can receive any help from you.
Internet Information Services
ASP.NET
ASP.NET
A set of technologies in the .NET Framework for building web applications and XML web services.
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VB
VB
An object-oriented programming language developed by Microsoft that is implemented on the .NET Framework. Previously known as Visual Basic .NET.
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(80, 82%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBZ%3C/text%3E%3C/svg%3E)
Bruce Zhang-MSFT 3,741 Reputation points2022-01-28T06:17:15.88+00:00 Hi @Calvin Chan ,
Did you move this application from old server to new server? If so, how you move it?
This kind of exception needs to be pinpointed to a specific piece of code to know what caused the error. I think you can use Debug Diagnostic Tool to get a detailed error log. Then use Debug Diagnostic Analysis to get a readable report.
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Chan Kok Kuen 1 Reputation point
2022-02-07T04:45:39.627+00:00 Hi @Bruce Zhang-MSFT ,
Yes, I move by copy the source code from the old server to the new server.
I have not experience in using this Dedug Diagnostic tool before, but I have done some research on this tool and below is the download link that I found.
https://www.microsoft.com/en-us/download/confirmation.aspx?id=58210May I know am I getting the right installer? If yes, may I know the steps of setting up this?
Many thank in advance.
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Chan Kok Kuen 1 Reputation point
2022-03-24T02:25:30.17+00:00 Hi @Bruce Zhang-MSFT ,
I have completed the diagnostic test and attached the exception report gotten from the diagnostic tool.
Appreciated you could help to scan through and pin point the exception that might causes the cryptographic error.186313-w3wp-defaultapppool-pid-12324-date-03-15-2022-time.txt
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