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asp.net authentication.

Hi Guys,
I have asp.net application which published on a Saas environment. My customers are connecting to this application login page without any issue.

Recently I have one customer that complain that he can't login to the application and he is getting this error (see attachment.)
In my understanding its related to the viewstate and key machine, but still I can't find the real cause of this issue. Again it happens just for one customer.

Thank you.

Misha

The firtst, look this good article from Microsoft. There are some cases from this problem and some solutions.
https://support.microsoft.com/en-us/help/2915218/resolving-view-state-message-authentication-code-mac-errors
The second you can add this code in your web.config file.

<pages enableeventvalidation="false" viewstateencryptionmode="Never"></pages>

Open in new window

It may be can help you.
The third, you can use machineKey Generators from this link and add it to your web.config file. Also you can read about this in the first article.
https://www.codeproject.com/Articles/16645/ASP-NET-machineKey-Generator

P.S.
File, which you attached, is file with very small permission. It is very difficault to read text from it.

Moti Mashiah

ASKER

Thank you for your answer.
I read all these articles regarding this issue, but still I missed understood how the connection works between the client to the server.

In my understanding the client send request (MAC) and the server generate for him a machine key which stored in his registry.
now what happens?

Please, can you explain the next part?

ASKER CERTIFIED SOLUTION

Misha

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Moti Mashiah

ASKER

Hi MIsha,
In my case I don't have a farm.
I have just one individual server, and still it happens to me.

Moti Mashiah

ASKER

Thank you MIsha that was very helpful.