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Hello, I am in the process of upgrading one single DC (internal DNS) to 4.8.12. I have followed the procedure of adding a new DC, transfert FSMO roles and demote the old DC. Everything gone right (except at the tranfert FSMO step where I faced the problem described here https://lists.samba.org/archive/samba/2017-August/210140.html , this bug subsists in 4.8.12 , maybe it has been fixed in later

...t; > The other school of thought is to upgrade in place, doing it this way means > that you do not have to change anything, this is the way I do it, without > problem, of course YMMV ;-) > > You should have used 'samba-tool domain demote --remove-other-dead- > server=<The _Old_DC>' I trusted the demoting procedure on the Wiki . I thought it was ok since my old DC was online and ok. I guess it is too late to do that one now ? > > You will probably have to trawl through sam.ldb and find the records that > need to be removed and then try and remove them wi...

...you will deplete the ridpool. The other school of thought is to upgrade in place, doing it this way means that you do not have to change anything, this is the way I do it, without problem, of course YMMV ;-) You should have used 'samba-tool domain demote --remove-other-dead-server=<The _Old_DC>' You will probably have to trawl through sam.ldb and find the records that need to be removed and then try and remove them with samba-tool and/or ldb-tools. You will need to add your new DC to the SOA before removing the old DCs record. Rowland