Article ID: 961432 - View products that this article applies to.
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On a Microsoft Exchange Server server that is running Microsoft Forefront Security for Exchange Server, you may notice mail queues start to form. If you perform a Performance Monitor analysis, you may notice lots of Lightweight Directory Access Protocol (LDAP) queries.
Remote procedure call (RPC) threads may become unavailable if there are lots of LDAP queries. The unavailability of RPC threads causes e-mail messages to queue up.
To workaround this problem, disable Content Filtering for the Realtime scan job. To do this, follow these steps:
To resolve this problem, install Forefront Security for Exchange Server with Service Pack 2 (SP2).
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/960465/ )Description of Forefront Security for Exchange Server with Service Pack 2
Article ID: 961432 - Last Review: January 15, 2015 - Revision: 2.0