Connect Error when Instala IPA files

Until now was running well the download IPA files via QR code to install the app on Iphone certified. But now there is a mistake as the image:

Is not possible connect with the ios Test_Server.

No problem here.

I have tested now and is running. But, before now, is not running.

Was this URL saved from a previous build? The 2 hour expiration rule still applies to IPA builds, so using the URL scanned from an old QR code might result in the installation request being rejected.

No. The URL was a new URL I build the IPA and install it at the same time. No problem, now is running well.