Internal pipes don't have a transport, so checking for presence of a transpport in rpccli_is_connected() always fails. This causes winbindd to process SAMR and LSA requests for the local domain twice. Have WIP patch, need bugnumber.
https://gitlab.com/samba-team/samba/-/commit/f50987df038846f0052d4c33bb534af9f2c79061