userAccountControl: 0x82020 = ( UF_PASSWD_NOTREQD | UF_SERVER_TRUST_ACCOUNT | UF_TRUSTED_FOR_DELEGATION );

To restore the default "userAccountControl" attribute value for the computer account you can either use LDP or ADSIEDIT.MSC. Here I will explain how to change it with ADSIEDIT.MSC.

When using ADSIEDIT.MSC:

•From the command-line start ADSIEDIT.MSC
•Connect to the domain NC
•Navigate to the OU or container that contains the computer account of the server for which the "userAccountControl" attribute value must be changed
•Right click on the computer account of the server for which the "userAccountControl" attribute value must be changed and retrieve the properties
•Scroll down to the "userAccountControl" attribute
•You should see some value:
•If the server already is a DC change the value to: 532480