Event ID 84 occurs in Active Directory Rights Management Services (AD RMS) in Windows Server

Applies to: Windows Server 2016Windows Server 2012 R2 DatacenterWindows Server 2012 R2 Essentials


On a Windows Server-based computer that has Active Directory Rights Management Services (AD RMS) installed, you receive the following event:


This issue occurs because the AD RMS logging process does not log an event to the logging database.

There are two tables in the logging database that refer to a UserAgentId value. Both the dbo.UserAgent and the dbo.ServiceRequest tables have a UserAgentId column. These columns are both of data type smallint. As soon as the UserAgentId value exceeds the maximum value (~32,767), the logging database cannot update. When a transaction does not log, RMS will roll back the request and throw an error.

More information

When requesting a license from AD RMS, clients are passing agent strings with the basic information about the requesting application. The dbo.UserAgent table only stores unique agent strings.

Originally, the MSIPC clients just passed in versions of OS, application, MSIPC, and architecture. The table in which the strings are stored only keeps unique entries. There should not be lots of unique strings across the user base.


At some point, the MSIPC client started including the process ID (PID) to that user agent string. This makes every string unique.


Therefore, the table that should not have terribly many unique strings to store now has many thousands.


To work around this issue, disable logging on the AD RMS cluster:

Disable logging


To resolve this issue, change the data type of the columns from smallint to int (integer). To do this, follow these steps:

Note A large logging database (DB) may take a long time to alter and may cause SQL performance issues. Therefore, we recommend that you back up the SQL DB from the production SQL instance and restore it on a nonproduction SQL location. After that, you can perform the database alteration on the nonproduction SQL location, and then replace the production DB.

  1. Back up the AD RMS logging database.
  2. Collect the SQL information.
  • The AD RMS logging database name
  • The Dbo.UserAgent key name

SQL information

     3. Generate the script (see the following sample).

Sample Script

Note Edit the database name and the UserAgent table key value to reflect the target environment.

/*******************************************************************************  THIS TOOL AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,  EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED  WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE. *******************************************************************************/ use [DRMS_Logging_ipc_treyresearch_net_443]go ALTER TABLE [dbo].[ServiceRequest] drop CONSTRAINT [FK_CLIENTINFOID_ServiceRequest_UserAgent]GO Alter table [dbo].[ServiceRequest] alter COLUMN [UserAgentId] intGO ALTER TABLE [dbo].[UserAgent] DROP CONSTRAINT [PK__UserAgen__UserAgentId]GO Alter table [dbo].[UserAgent] alter COLUMN [UserAgentId] intGO Alter table [dbo].[UserAgent]    ADD PRIMARY KEY (UserAgentId)GO ALTER TABLE [dbo].[ServiceRequest]  WITH CHECK ADD  CONSTRAINT [FK_CLIENTINFOID_ServiceRequest_UserAgent] FOREIGN KEY([UserAgentId])REFERENCES [dbo].[UserAgent] ([UserAgentId])GO ALTER TABLE [dbo].[ServiceRequest] CHECK CONSTRAINT [FK_CLIENTINFOID_ServiceRequest_UserAgent]GO