Explanation: There may be corrupted pattern files or components in the OfficeScan server's cache.
Solution: Clear the cache of the OfficeScan server and any proxy in your network. Refer to the following page for the complete solution: http://esupport.trendmicro.com/support/viewxml.do?ContentID=EN-116015&id=EN-116015
Explanation:
The ActiveUpdate folder on the Update Agent is empty. While downloading from the Trend Micro ActiveUpdate server, a network issue or another event might affect the process. This could either corrupt the files in the \PCCSRV\download folder or fail to download any of the update files.
The Update Agent has insufficient disk space.
Solution: Refer to the following page for the complete solution: http://esupport.trendmicro.com/support/viewxml.do?ContentID=EN-127369&id=EN-127369
Explanation: The proxy server requires authentication.
Solution: Disable proxy server authentication and try again.