If you are distributing Twixl Publisher builds in-house with over-the-air (OTA) installation and have upgraded your devices to iOS 7.1, you may have run into an error message that says 'Cannot install applications because the certificate for [URL] is not valid.'
Apparently, iOS 7.1 OTA installations now require SSL validation in order to install properly.
How to solve this:
install an SSL certificate for your distribution server, then create over-the-air install files with the https URL.
alternatively go back to good old iTunes syncing: add the .ipa file to iTunes and sync with your device
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