Hello Alok,
Thank you for the details provided, the messages "UnwillingToPerform-SvcErr: The server cannot handle directory requests" and "Problem 5003 - WILL_NOT_PERFORM messages" indicate that there's an operation being sent to Active Directory that is invalid.
Updating RDN attribute is currently unsupported and will cause the error message you've experienced, the resolution for this issue is to either remove the attribute from the mappings or apply the mapping "Only during object creation".
If you would like to take a deeper look at the behavior and discuss the resolution, I would recommend creating a support case and include the application ID and the same sample provided on this forum.
Thanks!
-Jessie