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MTP/PTP blocking not allowing Apple devices to charge

keiths

I've found that this question has been asked before but I can't find a resolution.

We use MTP/PTP blocking on our network to prevent data transfer from a USB device to the PC. Since applying this block we have discovered it also prevents iPhones from charging via the USB port but other devices such as Android are still able to charge. Do you know if this is has been fixed, is likely to be fixed or whether there is a work around?

Thanks



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  • 0

    Hello keiths,

    this is a known and expected behaviour - please see An overview of MTP/PTP support ... (I see it links to a Community thread with contributions by yours truly)

    Christian

  • 0 in reply to QC

    Hi Christian, I'd read that article and the community thread but wondered whether anyone had discovered a workaround since.

    Thanks for reply

  • 0 in reply to keiths

    Hello keiths,

    as you've read, not to charge is a decision the "other side" makes - thus it's not a question of allowing. In theory it should with a driver be possible to make a USB port appear as charging port but if you want to preserve its other functionality it's a chicken and egg problem. Even this could be overcome by simulating an unplug-plug sequence, this would be hardware-dependent though. Quite some effort to make it generally work and work reliably just to accommodate to a vendor's quirks. It'd probably cost Sophos less to give each affected user a power bank for free [:P]

    Christian 

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  • 0 in reply to keiths

    Hello keiths,

    as you've read, not to charge is a decision the "other side" makes - thus it's not a question of allowing. In theory it should with a driver be possible to make a USB port appear as charging port but if you want to preserve its other functionality it's a chicken and egg problem. Even this could be overcome by simulating an unplug-plug sequence, this would be hardware-dependent though. Quite some effort to make it generally work and work reliably just to accommodate to a vendor's quirks. It'd probably cost Sophos less to give each affected user a power bank for free [:P]

    Christian 

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