Issue:
Shared Services User Profile import is working but none of membership groups are being imported.
Log file has zero PEOPLE_DL_IMPORT enties, but user profiles are being imported successfully.
Solution:
Check your “Office Server Web Services” web app – by default its configured with SSL on port 56738 & self published cert.
Membership groups import uses SSL channel and SSL cert can be corrupt.
Strangely it uses SSL channel instead of straight HTTP even thou “Use Secure Sockets Layer (SSL)” in “Shared Services Provider” is set to “No”:
Antek Group Blog 
thx u very much, i learn a lot