According to Symantec, the solution is to not install SUM on a server.
This problem happens when both the client and the server have the SUM
Shield INIT in their System Folders. The SUM software is not intended for
use on a server.
On AppleLink, you can find contact information on Symantec by clicking the
"Library Index" button in the lower-center of the Tech Info Library search
window, then opening the "Third Party Company Directory" folder.