This is one of two hotfix KB articles being released in conjunction with the OpsMgr07 Service Pack 1 Release Candidate (general availability on track ETA next week). This will be required if multihoming an SP1 RC (eventually SP1 RTM) agent to an Operations Manager 2007 original release management server. This fix needs to be installed on the Opsmgr original release management server.
The other article now released is http://support.microsoft.com/kb/941811 (A memory leak occurs if an agent of the Microsoft System Center Operations Manager 2007 original release reports to management servers of System Center Operations Manager 2007 Service Pack 1) .
Finally, another article pending release (http://support.microsoft.com/default.aspx/kb/944443) will be the SP1 fixlist. This will be a summary of current released hotfix KB articles, articles where fixes are provided in the SP as of current SP1 Release Candidate. I will update when the KB is published.
This hotfix will also be present on the SP1 Release candidate images for the 120-day Eval edition for SP1 RC (Slipstreamed), together with the SP1 RC upgrade image in the SupportTools/Hotfix/Release folder : SystemCenterOpsMgr07-RTM-KB941557-X86-AMD64-ENU.MSI