NFS not responding and mounts un-resposive.

Question

NFS not responding and mounts un-resposive.

Srikanth L 95 Microsoft Employee

Hi,

We are seeing the “NFS not responding” error message on client machines for the following volumes:

this error appears on the client machines (unix), I would like to have detailed debugging performed on the storage side to check for any network path or performance issues, or any other underlying cause. At times, we also observe that the mounts become unresponsive or hung.

This issue is happening randomly for last three days. Let me know if any other details required on the same.

Srikanth L 95 Reputation points Microsoft Employee

2026-05-21T00:24:58.13+00:00

please increase the priority of the case.

As suggested tried this from impacted host.

Showmount -e <IP address> returning the NFS mount

please find the ping response below.
Thanmayi Godithi 11,555 Reputation points Microsoft External Staff Moderator

2026-05-21T03:53:37.6266667+00:00

Hi Srikanth L ,

Thank you for providing the details.

I will check and will reach out to you on Teams shortly.
Srikanth L 95 Reputation points Microsoft Employee

2026-05-21T09:00:45.0933333+00:00

As we discussed, I have uploaded the logs. let me know if you can access the same

1 answer

Your answer

Srikanth L 95 Reputation points Microsoft Employee

2026-05-21T00:24:58.13+00:00

please increase the priority of the case.

As suggested tried this from impacted host.

Showmount -e <IP address> returning the NFS mount

please find the ping response below.
Thanmayi Godithi 11,555 Reputation points Microsoft External Staff Moderator

2026-05-21T03:53:37.6266667+00:00

Hi Srikanth L ,

Thank you for providing the details.

I will check and will reach out to you on Teams shortly.
Srikanth L 95 Reputation points Microsoft Employee

2026-05-21T09:00:45.0933333+00:00

As we discussed, I have uploaded the logs. let me know if you can access the same

Answer 1

Thanmayi Godithi 11,555 Microsoft External Staff Moderator

During analysis, it was identified that the NFS mount was configured to use the UDP protocol. UDP is a connectionless protocol and does not guarantee packet delivery or ordering, which can lead to instability or retransmission issues, especially in non-ideal network conditions.

Resolution: The issue was identified to be caused by the NFS mount using the UDP protocol. During the debugging session, the NFS path was remounted with the appropriate configuration, which resolved the issue.

Post-change, the issue has not reoccurred and services are functioning as expected.

0 comments