Transient DNS resolution failure to platform endpoint 168.xx.xx.xx— VM

On 2026-10-09 between 04:35:05 and 04:49:53 UTC, VM experienced continuous DNS resolution timeouts. The VM's only configured nameserver is 168.XX.XXX.XX. We have ruled out disk exhaustion, memory/OOM, connection tracking table exhaustion, and ARP/neighbor table overflow on the guest OS. Resource Health for this VM shows no platform fault during this window — only our own subsequent manual reboot at 04:49–04:51 UTC, which resolved the issue. We would like to understand whether there was a host-side or SDN-level event affecting this VM's connectivity to the platform DNS relay during this window.

Secondary/lower-priority note: the VM has also logged recurring page_pool_release_retry() stalled pool shutdown kernel messages on the hv_netvsc interface since approximately October 2, continuously and unchanged — unrelated to the acute incident but possibly worth a look.

We were able to fix the issue by restarting the server but would like to understand why a transient loss of connectivity to Azure's platform DNS relay happened.