If you have problems establishing or maintaining connections between your servers, try one or more of the following:
Do not remove the source or destination server from the NDS tree. The servers must be able to communicate with the other servers in the tree during the migration.
Make sure the destination and source servers can communicate with each other.
For IPX connections, enter DISPLAY SERVERS at the server console. For IP connections, enter PING at the server console.
If you are using IPX, make sure the frame type and the IPX network number/server ID are consistent between the source and destination servers. For IP connections, verify that you have corresponding addressing, subnet mask, and gateway information.