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# Troubleshooting

## BlackBerry OS 10.2

BlackBerry OS up to 10.2.2102 does not accept a URL with protocol `https://` in front of the server address. It will always tell you that it cannot login on your server. So instead of writing:

    https://address/remote.php/carddav/principals/username

in the server address field, you have to write:

    address/remote.php/carddav/principals/username

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