Active Directory COM Exception - An operations error occurred (0x80072020)

Question

I am getting an intermittent COM Exception \"An operations error occurred (0x80072020)\" (shown below) when I try and query Active Directory using the metho

Answer 1

I've now found another answer Unable to add user with CrmService API in Dynamics CRM which states that 0x80072020 is indeed a permission issue. I have changed my service to run under a domain level account instead of the local system account and this seems to have cured my problem.