Connector Server crashes when changing an endpoint's exchange server: Modification failed: Connector Server Modify failed: code 51 (BUSY): failed to modify entry

Document ID : KB000105796
Last Modified Date : 09/07/2018
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Issue:
 The following error is observed when trying to update the Exchange server for an endpoint via Provisioning Manager.

:ETA_E_0007<MDI>, Active Directory Endpoint 'ADPROD' modification
failed: Connector Server Modify failed: code 51 (BUSY): failed to modify
entry:
eTADSDirectoryName=ADPROD.eTNamespceName=ActiveDirectory,
dc=prod,dc=etacom: JCS@myserver155: JMDI: Failed to activate
connector on proxy connector server: localhost:20402; socket closed
(ldaps://myserver155.ca.com:20411)

CCS connector server crashes and restarts.
Cause:
A crash dump indicates that the problem is residing in the RPC layer. It seems something is wrong with network/DNS . Hence, unable to connect to the RPC server.

ERROR_CODE: (NTSTATUS) 0x6ba - The RPC server is unavailable.

EXCEPTION_CODE: (Win32) 0x6ba (1722) - The RPC server is unavailable.

STACK_TEXT:
02bdec58 7473fb4a 000006ba 00000001 00000000 KERNELBASE!RaiseException+0x48.....

This problem is happening while retrieving all domain controller server’s details from primary DC (DNS) by using RPC calls. This is used for failover purposes.
Resolution:
We can bypass this failure by using a configuration file which is located in
<PS_HOME>\data\ads\<directory-name>.DNS (NOTE: directory-name is same as endpoint name).

<directory-name>.DNS need to be configured with all available DC server details.