This message occurs when the Windows Domain Controller (DC), while responding to an MSRPC request from Data ONTAP, returns an error indicating that it ran out of
pipe instances in the listening state. This can occur when the requests from Data ONTAP are received by the DC during a timing window, when the limited number of
listening pipe instance are already allocated to other requests. Such errors received by Data ONTAP might result in longer CIFS/NFS authentication and/or access times, potentially resulting in CIFS/NFS client timeouts. The event will also include the SVM that encountered the failure, the domain controller (DC), pipe on the DC, and the number of retries.
I am not sure if MS support had checked for listening instances at the time of issue from DC end. However, the best to understand this or confirm this is to collect simultaneous packet traces from storage and DC end at the time when error is being reporting. You can run rolling traces from both end.
For further troubleshooting or analyzing the traces, please open a NetApp support case.