Here is a solution to this problem. You are not able to retrieve the old password and you should create the new one directly from the database.
Below are the steps that should be performed.
1.Open your database.
3.Select "Password Format
" column for your Admin user and change its value from "1" to "0".
4. Enter a new password in "Password"
column. When the Password Format is set to zero, the password is plain text.
5.Save all changes then log in using the new password for the desired user.
Hope this helps.
the Telerik team
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