GDPR compliance document

Component: NServiceBus
NuGet Package NServiceBus (6.5-pre)
This page targets a pre-release version and is subject to change prior to the final release.

When operating an NServiceBus-based application, the platform will collect various pieces of information that are necessary to fulfill its operations. It is possible that some of this information will need to be considered when evaluating the application for GDPR compliance.

PII stands for personally identifiable information (also know as personal data) which means any information relating to an identifiable person who can be directly or indirectly identified.


OriginatingEndpointContains endpoint name
OriginatingMachineContains the machine from which the message originated
ReplyToAddressContains the queue name that should get the answer

These system headers are not configurable and should be considered present on all messages that originate from within the application.

If the application makes use of custom headers the custom code implementing them will need to be evaluated on an individual basis.


NServiceBus has built-in logging that can collect PII information. Application logging can be configured to reduce or eliminate this data from the application's log files.

Subscription entries

If the application is using the publish/subscribe capabilities of NServiceBus, and the MSMQ transport is being used, endpoint names will be captured in the log files if the logging infrastructure is set to DEBUG level.

Current Windows user name

When the application is running, NServiceBus can log the user account name that its process is currently running under. This data can be captured when logging infrastructure is set to the INFO level and the MSMQ transport is being used.

Message bodies

Although not standard, it is possible that an application's message bodies will be logged along with the PII that they contain. This will occur only if the application's logging level is set to DEBUG and if the message types have had the .ToString() method overridden to write out the PII data.

Startup diagnostics

During endpoint startup, NServiceBus will write a diagnostics file for debugging and support purposes. This file will include the following data that could contain PII.

Hosting - Machine NameRuntimeEnvironment.MachineName
Hosting - HostNameDns.GetHostUserName()
Hosting - UserNameEnvironment.UserName
Receiving - LocalAddressEndpoint Name
Receiving - LogicalAddressEndpoint Name
Receiving - Satellites - NameSatellite Name
Receiving - Satellites - ReceivingAddressSatellite Address

The diagnostics file will also include a listing of all message type names, endpoint names, and queue names.

More information on where to find the diagnostics file, and how to customize it, can be found in the hosting documentation.


ServiceControl, using audits and error consumption, saves a set of information related to consumed messages in its database:

OriginatingEndpointCustomChecksEndpoint Name, HostId, HostName
MessageMetadata/SendingEndpointFailedMessagesEndpoint Name, HostId, HostName
MessageMetadata/ReceivingEndpointFailedMessagesEndpoint Name, HostId, HostName
HeadersFailedMessagesAll of the headers like in the Headers section
EndpointsDetailsKnownEndpointsEndpoint Name, HostId, HostName
MessageMetadata/SendingEndpointProcessedMessagesEndpoint Name, HostId, HostName
MessageMetadata/ReceivingEndpointProcessedMessagesEndpoint Name, HostId, HostName
HeadersProcessedMessagesAll of the headers like in the Headers section

When this data needs to be deleted, contact Particular Support for assistance.


Data points such as "Endpoint Name" have been mentioned multiple times in this document. It's important to note that in many situations these pieces of data do not need to be considered with regards to GDPR. However, if that data has been configured to include PII, they will. It is best to avoid naming things in a manner that includes PII.

There are situations where this is not possible. For example, when using MSMQ as a transport the computer's name will be included in the name of the queues. This is a requirement of MSMQ and, as a result, means that queue names should receive the same vetting as machine names.

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