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Title
Upgrading the Portal from version 9 to version 10 fails with error "The user you specify must be a local administrator" -
Description
During the upgrade process, at the screen, "Specify Web Site Settings", the username account is correct and is grayed out. When entering the password, the following error displays: "The user you specify must be a local administrator". The account is a member of local administrator group.
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Cause
This issue can be caused if Rivest Cipher 4 (RC4) is disabled on the RMAD server, but enabled on domain controller.
This can also be caused if the account you are logged in as is the built-in Administrator account.
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Resolution
WORKAROUND 1:
If logged in as the built-in Administrator account, log in as a different account
WORKAROUND 2:
- Enable RC4_HMAC_MD5 via GPO
- Upgrade the Portal from version 9.0.1 to version 10
- Disable RC4_HMAC_MD5 via GPO
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Additional Information
This can also occur when there are certain mismatches between the enabled encryption types on a DC, the RMAD server, and the enabled encryption types on the user running the installer. https://blogs.msdn.microsoft.com/openspecification/2011/05/30/windows-configurations-for-kerberos-supported-encryption-type/