NServiceBus fails to connect to RavenDB during high load

Recently I experienced a serious issue with NServiceBus and RavenDB where the NServiceBus endpoints no longer were able to connect to RavenDB. The following error message was written to the Windows event log:
System.Net.Sockets.SocketException (0x80004005): An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full
It turned out that this is a known issue with using RavenDB. The solution is to enable the HttpWebRequest.UnsafeAuthenticatedConnectionSharing setting on the RavenDB client connection. Be aware of the security implications related to using this setting, as described in the MSDN documentation.
A configuration setting named EnableRavenRequestsWithUnsafeAuthenticatedConnectionSharingAndPreAuthenticate which could be set in order to avoid the issue was added to the configration API in version 4.0.0. However, the NServiceBus configuration API for RavenDB has later been rewritten, and there is currently no documentation available on how to enable this setting using the new API.

Follow these two steps to enable the setting:

Step 1:
Add a reference to RavenDB.Client for your NServiceBus project. You should use the same version as is referenced by your NServiceBus version.
Step 2:
Use the CustomiseRavenPersistence method on the configuration API to register a callback which can be used to configure the RavenDB client connection:

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