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# longhorn-storage
a
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l
can anyone let me know the hot fix for this, i need to upgrade or downgrade the kernel versions ?? already i can see one open issue -> https://github.com/longhorn/longhorn/issues/6857
l
• https://longhorn.io/kb/troubleshooting-rwx-volume-fails-to-attached-caused-by-protocol-not-supported/It : it seems only a problem of 6.5.6 version of the kernel What version of nfs does your OS support? I think v4.1 is needed ... Moreover, you should have loaded the nfs module right? If nfs is ok, can you try to manually execute the mount command? Just to see if your case is the same as the ones in the link https://github.com/longhorn/longhorn/issues/6857
l
yes version 4 it is running i am not how to see the exact version number
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nfsv4                 835584  0
nfs                   393216  1 nfsv4
can you share the handy comments to trouble shoot this issue
l
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mount -t nfs -o vers=4.1,noresvport,intr,hard 10.43.127.226:/pvc-f2b1b404-c52f-4b6e-8106-83ef17100755 /var/lib/kubelet/plugins/kubernetes.io/csi/driver.longhorn.io/4a7a43396c5e4a180f5fd08d0c3b3dac436600bde1f454a859e411741e067ab5/globalmount
t
I'm also experiencing this. but on flatcar 3602. i'm seeing errors like this in 
longhorn-manager
on the node with the workload:
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10.42.148.65 - - [19/Feb/2024:15:39:35 +0000] "GET /v1/volumes/eol-test HTTP/1.1" 200 9059 "" "Go-http-client/1.1"
W0219 15:39:37.587071       1 logging.go:59] [core] [Channel #847791 SubChannel #847792] grpc: addrConn.createTransport failed to connect to {
  "Addr": "10.42.148.69:8502",
  "ServerName": "10.42.148.69:8502",
  "Attributes": null,
  "BalancerAttributes": null,
  "Type": 0,
  "Metadata": null
}. Err: connection error: desc = "transport: Error while dialing: dial tcp 10.42.148.69:8502: operation was canceled"
l
It seems a network issue
l
it is fixed in 6.2.0 kernel version [from azure ubuntu images]
👍 1
t
hm, flatcar is using 5.15 as well, so maybe it's the same..?
updated to flatcar 3815 which has kernel 6.1.77 and that solved it for me. no mention of nfs in any relevant flatcar changelog
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