Thank you for your reply.
So i'm trying to install freeipa as a replica using the following command until it says LDAP error: Invalid credentials.
What is missing?
# ipa-replica-install --principal=admin --admin-password=XXXX --server=oldserver.domain.local --domain=domainlocal --realm=DOMAINLOCAL --setup-dns --mkhomedir --ssh-trust-dns --auto-reverse --forwarder=.....
[...]
Run connection check to master
Connection check OK
Configuring directory server (dirsrv). Estimated time: 30 seconds
[1/41]: creating directory server instance
[2/41]: enabling ldapi
[3/41]: configure autobind for root
[4/41]: stopping directory server
[5/41]: updating configuration in dse.ldif
[6/41]: starting directory server
[7/41]: adding default schema
[8/41]: enabling memberof plugin
[9/41]: enabling winsync plugin
[10/41]: configuring replication version plugin
[11/41]: enabling IPA enrollment plugin
[12/41]: configuring uniqueness plugin
[13/41]: configuring uuid plugin
[14/41]: configuring modrdn plugin
[15/41]: configuring DNS plugin
[16/41]: enabling entryUSN plugin
[17/41]: configuring lockout plugin
[18/41]: configuring topology plugin
[19/41]: creating indices
[20/41]: enabling referential integrity plugin
[21/41]: configuring certmap.conf
[22/41]: configure new location for managed entries
[23/41]: configure dirsrv ccache
[24/41]: enabling SASL mapping fallback
[25/41]: restarting directory server
[26/41]: creating DS keytab
[27/41]: ignore time skew for initial replication
[28/41]: setting up initial replication
Starting replication, please wait until this has completed.
Update in progress, 15 seconds elapsed
[ldap://oldserever.domain.local:389] reports: Update failed! Status: [Error (49) - LDAP error: Invalid credentials]
[error] RuntimeError: Failed to start replication
Your system may be partly configured.
Run /usr/sbin/ipa-server-install --uninstall to clean up.
Failed to start replication
The ipa-replica-install command failed. See /var/log/ipareplica-install.log for more information