Server 2008R2 DC: Errors: (8606),(1256),(8446)

[ZamanSA]

Hi All,

I am facing these errors in our 2008R2 domain controller when I ran the Repadmin /replsummary cmd. Could someone please help me resolve these errors ?

estination DSA largest delta fails/total %% error
ALBION >60 days 2 / 24 8 (8606) Insufficient attributes were given to create an object. This object may not exist because it may have
been deleted and already garbage collected.
CALEDONIA 12m:36s 0 / 24 0
CAMBRIA 16m:40s 0 / 17 0
GERMANIA 22m:45s 0 / 12 0
GONDOR >60 days 19 / 39 48 (5) Access is denied.
HIBERNIA 22m:33s 0 / 17 0
MORDOR >60 days 15 / 29 51 (1256) The remote system is not available. For information about network troubleshooting, see Windows Help.
SCYTHIA >60 days 7 / 19 36 (8446) The replication operation failed to allocate memory.

[#2]

These ones may help.
https://docs.microsoft.com/en-us/troubleshoot/windows-server/identity/replication-error-8446
https://docs.microsoft.com/en-us/troubleshoot/windows-server/identity/replication-error-8606

The ones that are greater than 60 days may have tombstoned. In that case the solution is to demote, reboot, promo it again.