"Unable to reach iFly servers" or "Server unreachable" means the app tried to check your licence or download data and got no answer. Work down the list for your device.

Any device

1. Is the device online? Open a web page in the browser. A Wi-Fi network with no internet (an ADS-B receiver, an aircraft hotspot with no signal) looks connected and is not.
2. Is the date and time right? A wrong clock breaks the secure connection. Set it automatically in the device settings, or correct it by hand.
3. Is iFly current? Update from the App Store, Play Store or iflyefb.com/WindowsDownload.
4. Are you signed in with an active subscription? Menu › About › My Account should show your account and an expiry date in the future.
5. Restart the device.
6. Still failing: uninstall and reinstall iFly, then sign in again.

Android

• Storage. This is the single biggest cause. If the device is nearly full, downloads fail and Android may delete iFly's files. Free up space, and in Settings search for Storage Manager or Smart Storage and turn it off.
• If iFly's data is on an external SD card, try moving it to internal storage. SD cards that unmount briefly cause exactly this error.

Windows

• Firewall or antivirus blocking the app. Search Windows for Allow an app through Windows Firewall and check both boxes for iFly EFB; check any third-party security suite too.
• VPNs and proxies can block the connection. Turn them off to test.

iFly 740 and 740b

• The unit is 2.4 GHz Wi-Fi only. If your router or phone hotspot is 5 GHz-only, or the hotspot is 5G-only, the unit cannot reach the internet. Enable a 2.4 GHz band, or use iFly Connect on a computer to download updates and copy them to the SD card.
• Confirm the subscription is active from a phone or the website.
• If the unit is online, subscribed and still cannot reach the server, the SD card is the usual suspect. See Reinstall the operating system, or replace the card.