I recently installed SP1 for Windows Server 2003 on my SMS box.  After doing so, I had a couple of developers tell me they could no longer connect using their SMS console.  I found this on the SMS mailing list.  This fixed my problem.

We determined that WMI or DCOM was the source of the access problem.  Through research and experimentation, Brian found the solution – it is a DCOM configuration. 

a)                   a)                   Run the DCOM configuration tool, dcomcnfg.exe from the command line.

b)                   b)                   Under Component Services-Computers, locate My Computer.

c)                   c)                   Right click and choose Properties.

d)                   d)                   Select the COM Security tab.

e)                   e)                   Click “Edit Limits” in the Launch and Activation Permissions box.

f)                     f)                     Add the local SMS Admins group, then allow this group permissions to “Remote Activation”.