error 1718 when install Visual Studio 2005 Service Pack 1

I tried to install SP1 on Visual Studio 2005 on a very powerful server. It takes quite a lot of time to get it going. however when I thought it was almost over, it shows an error:

“Error 1718, file:xxxxxxxxxx.msp was rejected by digital signature policy”

Looked the error code from Google and I noticed Heath Stewart has documented this problem with a wonderful solution:

that is Set the DWORD registry value PolicyScope to 1 in the HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsSaferCodeIdentifiers registry key. if this DWORD entry does not exist, create it. Do not forget to reboot your computer after changing the registry. Then installing SP1 again will not show the error.

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551 User not local; please try

Recent two weeks my website’s email system has a lot of emails returned. And the error messages are exactly the same.

The error message is

“551 User not local; please try <forward-path>”

All emails returned have same characters: The recipients’ email servers are located in China. sina,, 163, and sohu, no exceptions.

I did some googling and found out this has something to do with China’s Great Fire Wall. 10.1 is a special day in China. The fire wall might have been tightened.

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