PostgreSQL GSSAPI Windows AD

Hi,

I've recently updated from PostgreSQL 9.6 to 14 and also ubuntu 16.04 to 22.04.
I've made all the installation required for postgresql to connect in GSSAPI authentication to a Windows domain.

Something is going wrong and I don't know why.
When I change the mapped user password from "postgres" to anything else, the connection stop to work

Log of postgres:
Unspecified GSS failure. Minor code may provide more information: Request ticket server postgres/ubuntu(dot)ad(dot)corp(dot)com(at)AD(dot)CORP(dot)COM not found in keytab (ticket kvno 3)

Here is the ktpass command (Windows AD):

working:
ktpass -out postgres.keytab -princ postgres/UBUNTU(dot)ad(dot)corp(dot)com(at)AD(dot)CORP(dot)COM -mapUser AD\pgsql_ubuntu -pass postgres -mapOp add -crypto AES256-SHA1 -ptype KRB5_NT_PRINCIPAL

not working:
ktpass -out postgres.keytab -princ postgres/UBUNTU(dot)ad(dot)corp(dot)com(at)AD(dot)CORP(dot)COM -mapUser AD\pgsql_ubuntu -pass other_password -mapOp add -crypto AES256-SHA1 -ptype KRB5_NT_PRINCIPAL

I put the keytab on the postgres server, the keytab file is referenced in the postgresql.conf file.

Here is the full procedure:

1. Create user in AD for postgresql mapping (pgsql_ubuntu), always valid, support AES256
2. Create another user for connection testing
3. run ktpass command
4. put the keytab file on the pg server in /etc/postgresql, chown to postgres and chmod 600
5. postgresql.conf krb_server_keyfile = '/etc/postgresql/postgres.keytab'
6. pg_hba is configured to connect over gss
7. ubuntu server (postgres) is added to domain with this command:
sudo realm join server.ad.corp.com -U Administrateur

I don't know why it works when the password is "postgres" and why I can't change it.

With best regards,