Hi MS team,
We recently had to build all the CAS servers from scratch due to a maintenance to repair catalog index failed on the exchange 2013 environment.
With this change, some users are unable to lookup users from the GAL. When you try to manually download the GAL, you can see following error:
Task 'firstname.lastname@example.org' reported error (0x8004010F) : 'The operation failed. An object cannot be found.'
2013 CU8 all the servers
Windows 2012 R2 OS for all the VMs
5 mailbox servers in a DAG
4 CAS servers behind a F5 HLB
2 Edge servers per site
Any ideas on how to resolve this issue?