Learn how to troubleshoot the NFS4ERR_MINOR_VERS_MISMATCH error. Our NFS Support team is here to help you with your questions and concerns.

How to Fix NFS4ERR_MINOR_VERS_MISMATCH Issues

If you have run into the NFS4ERR_MINOR_VERS_MISMATCH error code (10021) while working with NFS, you have come to the right place.

This error is often due to a minor version mismatch between the NFS client and server. Today, we are going to take a look at the causes of this error and how to fix it.

What is NFS4ERR_MINOR_VERS_MISMATCH?

The NFS4ERR_MINOR_VERS_MISMATCH error occurs when the NFS client tries to mount a share using a minor version that the NFS server does not support. In other words, the minor version specified by the client does not match what the server can handle.

Causes of NFS4ERR_MINOR_VERS_MISMATCH

• Minor Version Mismatch:

  If the NFS client is using a newer minor version that the server does not support we will get an error message.

  Similarly, if the NFS client is using an older minor version that the server no longer supports, we will run into the error message.
• Network Connectivity Issues:

  Furthermore, network problems can prevent the NFS client from mounting the share. This will lead to the NFS4ERR_MINOR_VERS_MISMATCH error. This usually happens when the client is unable to establish a connection with the server due to network issues.

Solutions to NFS4ERR_MINOR_VERS_MISMATCH Error

• First, adjust the NFS client to use a supported minor version, such as NFSv3 or NFSv4.0, to successfully mount the share.
• Sometimes, rebooting the NFSv4 host can resolve the issue by allowing the client to negotiate a supported minor version.
• Restart the NFS service on the host to refresh configurations and connections.
  We can use these commands based on the Linux distribution:

  sudo systemctl restart nfs

  Or
  sudo service nfs restart
• Also, make sure the NFS service is running correctly:

  systemctl status nfs

  Or
  service nfs status
• Additionally, verify that the NFS server is configured to support the minor version being used by the client. Check the server configuration files, such as `/etc/exports`, to ensure compatibility.
• Verify that the NFS client configuration files, such as `/etc/fstab`, are correctly configured to mount the share.
• Also, make sure the NFS client and server are connected to the same network and that the network connection is stable.

Let us know in the comments if you need further help with the error.

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Conclusion

In brief, our Support Experts demonstrated how to troubleshoot the NFS4ERR_MINOR_VERS_MISMATCH error