Linux NFS unsupported protocol error after power failure











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Everything was smooth until a power failure.



One of my servers and a client are both running Xubuntu 18.04. This server has
internal 4T data disk and an 8T external USB backup drive mounted at /A and /B respectively. The /etc/exports file was unchanged and has these 2 lines:



/A/a      192.168.20.101/24(rw,no_subtree_check)
/B/b1/b2 192.168.20.101/24(rw,no_subtree_check)


Command "exportfs -r -a" was issued after /A and /B were mounted. When the client tried to mount (e.g., mount 192.168.20.143:/A/a /mnt/a), I get this error



mount.nfs: requested NFS version or transport protocol is not supported


This never happened before the power failure. This error persisted even after I completely removed and re-installed nfs-kernel-server and nfs-common in both the client and the server.



What makes things more confusing is that I have another linux server and a FreeNAS server running, and my client is able to mount NFS from both of them.



I have searched Google but I am unable to find the reason and unable restore nfs service from this server.



Please help. Thank you very much !!!










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    up vote
    0
    down vote

    favorite












    Everything was smooth until a power failure.



    One of my servers and a client are both running Xubuntu 18.04. This server has
    internal 4T data disk and an 8T external USB backup drive mounted at /A and /B respectively. The /etc/exports file was unchanged and has these 2 lines:



    /A/a      192.168.20.101/24(rw,no_subtree_check)
    /B/b1/b2 192.168.20.101/24(rw,no_subtree_check)


    Command "exportfs -r -a" was issued after /A and /B were mounted. When the client tried to mount (e.g., mount 192.168.20.143:/A/a /mnt/a), I get this error



    mount.nfs: requested NFS version or transport protocol is not supported


    This never happened before the power failure. This error persisted even after I completely removed and re-installed nfs-kernel-server and nfs-common in both the client and the server.



    What makes things more confusing is that I have another linux server and a FreeNAS server running, and my client is able to mount NFS from both of them.



    I have searched Google but I am unable to find the reason and unable restore nfs service from this server.



    Please help. Thank you very much !!!










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      Everything was smooth until a power failure.



      One of my servers and a client are both running Xubuntu 18.04. This server has
      internal 4T data disk and an 8T external USB backup drive mounted at /A and /B respectively. The /etc/exports file was unchanged and has these 2 lines:



      /A/a      192.168.20.101/24(rw,no_subtree_check)
      /B/b1/b2 192.168.20.101/24(rw,no_subtree_check)


      Command "exportfs -r -a" was issued after /A and /B were mounted. When the client tried to mount (e.g., mount 192.168.20.143:/A/a /mnt/a), I get this error



      mount.nfs: requested NFS version or transport protocol is not supported


      This never happened before the power failure. This error persisted even after I completely removed and re-installed nfs-kernel-server and nfs-common in both the client and the server.



      What makes things more confusing is that I have another linux server and a FreeNAS server running, and my client is able to mount NFS from both of them.



      I have searched Google but I am unable to find the reason and unable restore nfs service from this server.



      Please help. Thank you very much !!!










      share|improve this question













      Everything was smooth until a power failure.



      One of my servers and a client are both running Xubuntu 18.04. This server has
      internal 4T data disk and an 8T external USB backup drive mounted at /A and /B respectively. The /etc/exports file was unchanged and has these 2 lines:



      /A/a      192.168.20.101/24(rw,no_subtree_check)
      /B/b1/b2 192.168.20.101/24(rw,no_subtree_check)


      Command "exportfs -r -a" was issued after /A and /B were mounted. When the client tried to mount (e.g., mount 192.168.20.143:/A/a /mnt/a), I get this error



      mount.nfs: requested NFS version or transport protocol is not supported


      This never happened before the power failure. This error persisted even after I completely removed and re-installed nfs-kernel-server and nfs-common in both the client and the server.



      What makes things more confusing is that I have another linux server and a FreeNAS server running, and my client is able to mount NFS from both of them.



      I have searched Google but I am unable to find the reason and unable restore nfs service from this server.



      Please help. Thank you very much !!!







      mount power nfs protocol






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      asked Nov 21 at 4:33









      lisprogtor

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