Hi, After quite some time i am posting...was busy with work.

 I am facing one issue in our sms infrastructure, we had a problem with some secondary site as because of HDD crash, We have reinstall our secondary site server , as these site server was giving problem to connect to primary server so that we have removed entries AD,console entry in primary server, and start the fresh installation, It is appearing in SMS primary console  and working fine but strange thing is all distribution point group has been removed from  all secondary site servers and from primary server automatically. I am not able to understand why it is so?