"Digital Signature on the update is missing or Invalid"

[noah_swanson]

At this point no clients can run updates from our Mac Server. Regardless of the update selected the following error occurs:

- Title: "None of the selected updates could be installed" - Description: "The digital signature on the update is missing or invalid. The update may have been tampered with since being signed by Apple. The update will be downloaded and checked again the next time that Software Update runs"

I've tried the following via google search: "sudo rm ~/Library/Caches/com.apple.SoftwareUpdate/cache.db" all to no avail.

When using Apple's software update server, I do not receive any errors.

[noah_swanson]

I should add that if I copy and run the update straight from the server, the certificate in the package expired March 23, 2012. I'm assuming this is part of the error?

Again, Any help is appreciated!

[rob_potvin]

http://support.apple.com/kb/HT5198

You have to delete all of your updates and then have the server download the new ones from Apple.