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  1. [...] These times, my virtualisation needs are being well served by VirtualBox 2.2. It may be the closed source variant but I have no complaints about it. Along with a number Windows VM’s, I also have one running Ubuntu 9.04 and, for the first time, I seem to have VirtualBox’s Guest Additions playing with a Linux guest as they should. Even the Shared Folders functionality is working. However, I did get one problem when I tried running it first. The procedure is to use a command like the following af See the original post here: /sbin/mount.vboxsf: mounting failed with the error: Protocol error [...]

  2. [...] TechnologyTales.com placed an observative post today on /sbin/mount.vboxsf: mounting failed with the error: Protocol errorHere’s a quick excerptThese times, my virtualisation needs are being well served by VirtualBox 2.2. It may be the closed source variant but I have no complaints about it. Along with a number Windows VM’s, I also have one running Ubuntu 9.04 and, for the first time, I seem to have VirtualBox’s Guest Additions playing with a Linux guest as they should. Even the Shared Folders functionality is working. However, I did get one problem when I tried running it first. The procedure is to use a command like the following af [...]

  3. There is a simple solution which solved my problem on Open Solaris with an Ubuntu 9 guest. Instead of using mount -t vboxsf Public /home/andrius/Public, type this this one: mount.vboxsf Public /home/andrius/Public. It works!

  4. Thanks Andrius. I too have used mount.vboxsf with some success. It looks as if mount -t vboxsf is its alias in more customary syntax.

  5. mount.vboxsf shared_name path_to_shared_folder worked fine!!!
    Thanks a lot buddy

  6. Thanks Andrius! I’ve been searching the web for the past 1 hour to find a solution to this. What you suggested did the trick for me (Running Ubuntu 9.04 virtualized on WinXP).

  7. Hi all

    I’ve found this solution:


    (…)
    For example:

    mount -t vboxsf vshare /home/paulsiu/vshare

    The problem is when you tried this, you get the following error:

    /sbin/mount.vboxsf: mounting failed with the error: Protocol error

    If you look at syslog, you’ll see the following error:

    Nov 8 19:28:09 wxbuilder kernel: vboxvfs: sf_glob_alloc: vboxCallMapFolder failed rc=-102
    Nov 8 19:28:09 wxbuilder kernel: sf_read_super_aux err=-71

    Apparently, you’ll only get this error if you use the default sharename. When you create a new shared folder, Virtualbox will ask where your shared directory is on the host. When you select the shared directory, the sharename will default to that directory. If I create a shared folder at “/home/paulsiu/vshare”, virtualbox will generate a sharename of “vshare”. Unfortunately, if you use this default sharename, you will get a protocol error, so you should rename the sharename to something other than default, such as “vboxshare” for example. I have no idea why, but that appears to be what’s happening.
    (…)

    WORKS FINE FOR ME !! :)

  8. Had the same problem. Windows 7 host, Ubuntu 9.10 guest. Windows D drive shared with share name of DRIVE_D, created sharepoint /media/shared/. Whether mount or /sbin/mount.vboxsf, everything I tried elicited the protocol error.

    Finally, I changed the share name from the default DRIVE_D to shared and it worked. Played around with changing the share name, eventually changing it back to the VirtualBox default DRIVE_D and it still worked.

    This would appear to be a VirtualBox bug. Solution: don’t use the default share name.

    Nathanael

  9. I got this error, only because I forgot to add a share folder from Devices->Shared Folders. Stupid me :P

    1. Haha, same for me! (I actually unchecked accidentally the Make Permanent option in the shared folder) Luckily I read your post before I reinstalled the guest additions! Thanks!

  10. Hi i tried giving mount.vboxsf also tried changing the shared folder name but still its not working for me..The error is mount.vboxsf: mounting failed with the error: Protocol error.. Im using windows7 as my host and openSUSE as my guest os…

  11. After installing the VBox Addon, you have to restart your guest.

    1. Awesome. Many thanks. I was struggling for at least a day.
      Many thanks again.

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