Having problems with a NW65sp8 -> OES2 SuSE Transfer ID migration.

Everything seems ok, the file system goes over no problem, but when the
Transfer ID stage begins it wants me to re authenticate to both servers
but it always says it can't authenticate to the source and the migration
fails at that point.

All certs are fine, the tree health check passes ok, I can certainly
authenticate to the tree manually external to the migration tool, but
this is holding me up.

Any tips appreciated.