we can only migrate 4 or 5 objects and then get an error.Which object is failing to migrate? What error do you get?
It is recommended to perform the migration in the following order:
Domain Global Group
Domain Local Group
User Account
Computer Account
Also, please do not migrate the associated group members when migrating the group.
Group migration:
Copy group members - not checked
Fix membership of group - checked
ID history - checked
User migration:
Migrate associated user groups - not checked
Fix users'' group memberships - checked
SID history - checked
have you tried with fresh accounts?
from error log it looks like ADMT is failing to contact either source domain controller or target domain controller
Check if ADMT is able to connect to both side DCs without any issues and its not trying to connect to unreachable DC, probably put ADMT server in same segment as domain controller
I'd try to migrate groups and users separately.