AltServer Cannot Be Found | Wi-Fi Fixes That Work

When this message pops up, AltStore stops refreshing your sideloaded apps and you start worrying about expiry dates. The good news is that the problem usually comes down to a short list of network or computer settings, not a broken device.

This guide walks through what the message means, how AltStore and AltServer talk to each other, and the most dependable fixes on both Windows and macOS. You will also see how to stop the warning from coming back during weekly refreshes.

AltServer Cannot Be Found Error On Wi-Fi Networks

AltStore on iOS talks to AltServer on your computer over your local network or a direct cable. When that link fails, AltStore shows messages like “AltServer could not be found” and, in many cases, error code 1200. In plain terms, the phone cannot discover the computer that should be signing apps.

Behind this, three parts have to work together: AltStore on your iPhone or iPad, AltServer on your Mac or PC, and Apple’s own iTunes or Finder sync services. If any of those pieces stop talking, you see that altserver cannot be found screen instead of a successful refresh.

AltStore’s own documentation groups the common errors in this family. The table below gives you a quick map so you know which message you are dealing with and where to focus first.

If your message matches the 1200 description, focus on discovery: Wi-Fi, firewall rules, trust prompts, and AltServer itself. The next section covers the fastest checks that fix a large share of cases on both platforms.

Quick Checks Before You Change Settings

Before you dig through deep menus, clear the basics that often block AltStore from seeing your computer. These steps are simple, low-risk, and they help you rule out the most common slip-ups quickly.

• Confirm AltServer Is Running — On Windows, look for the AltServer icon in the system tray; on macOS, check the menu bar. If you do not see it, launch AltServer again and leave it open.
• Use The Same Network — Make sure your phone and computer sit on the same Wi-Fi network name. Guest, school, or office networks often isolate devices and block discovery.
• Try A USB Cable — Plug the iPhone or iPad into the computer with a cable and keep AltServer open. A wired link often bypasses awkward Wi-Fi rules and proves that the pairing itself still works.
• Check Trust Prompts — When you connect by cable, tap Trust on the iOS device and confirm on the computer. If trust was revoked or changed, AltStore will not talk to AltServer until this link is set again.
• Restart Both Devices — Restart the iPhone or iPad, then restart the Mac or PC. Fresh network stacks and services fix a surprising number of short-term glitches.
• Turn On Local Network Access — On iOS, open Settings > Privacy & Security > Local Network and make sure AltStore is allowed to use your network.

If these checks bring AltStore back to life, you have confirmation that nothing deeper is broken. If you still see altserver cannot be found, the fix usually sits in platform-specific settings, which you can adjust in a few minutes.

Fix Connection Problems On Windows

Most Windows-based problems trace back to Apple services, firewall rules, or how iTunes and iCloud were installed. AltServer relies on these helpers to see and talk to your iOS device, especially when you refresh apps over Wi-Fi.

Install iTunes And iCloud From Apple’s Site

AltStore’s FAQ warns that the Microsoft Store versions of iTunes and iCloud can break device discovery. The recommended setup uses Apple’s direct downloads for both tools, which include the right services and drivers.

• Remove Store Versions — Open Apps > Installed apps, uninstall iTunes and iCloud that came from the Microsoft Store, and restart the PC.
• Download From Apple — Visit Apple’s official iTunes and iCloud pages in your browser, download the Windows installers, and run them.
• Sign In And Enable Wi-Fi Sync — Open iTunes, sign in, click your device icon, and tick “Sync with this device over Wi-Fi,” then click Apply.

Once iTunes and iCloud come from Apple’s installers, AltServer can use the same drivers that iTunes uses to see your phone on the network.

Restart Apple Mobile Device Service And Bonjour

Windows services keep the bridge between your iPhone and AltServer alive. If those services hang, AltStore may stop seeing your device even though everything looks fine on the surface.

• Open The Services List — Press Ctrl+Shift+Esc, go to the Services tab, and click Open Services at the bottom.
• Restart Apple Mobile Device Service — Find Apple Mobile Device Service, right-click it, choose Restart, then wait a few seconds.
• Restart Bonjour Service — Look for Bonjour Service if installed, restart it in the same way, and then close the Services window.
• Relaunch AltServer — Quit AltServer from the system tray, then start it again with Run as administrator so it can listen on the right ports.

Many users report that simply restarting these services and AltServer brings their device back into the “Install AltStore to…” list and removes the connection error during refresh.

Allow AltServer Through Windows Firewall

If the firewall blocks AltServer’s incoming connections, AltStore will never see it over Wi-Fi, no matter how often you restart devices. You need a rule that allows AltServer on private networks.

• Open Firewall Settings — Search for Windows Defender Firewall, then click “Allow an app or feature through Windows Defender Firewall.”
• Find Or Add AltServer — Look for AltServer in the list. If it is missing, click Allow another app and browse to the AltServer executable.
• Enable Private Networks — Tick the Private checkbox, apply the change, and keep the Public box off unless you fully trust that network.
• Test Over Wi-Fi — With the firewall rule in place, close and reopen AltServer, then try refreshing apps from AltStore again.

If third-party antivirus software is installed, create a similar allow rule there so AltServer traffic is not blocked twice.

Fix Connection Problems On Mac

On macOS, AltServer depends on Finder and the Mail plug-in to reach your device and sign apps. When those pieces stop running or lose access, AltStore cannot complete its refresh, even when Wi-Fi looks fine.

Keep AltServer And Mail Plug-In Running

The AltServer icon in the menu bar needs to stay visible while you install or refresh apps. In addition, macOS uses a Mail plug-in to handle the signing process.

• Launch AltServer — Open AltServer from Applications and check that its icon appears in the menu bar near the clock.
• Open Mail App — Start the Mail app once, then check AltServer’s menu for an entry that confirms the plug-in is enabled. If it shows a prompt, follow the on-screen steps.
• Update AltServer — Use the AltServer menu to check for updates so AltStore and AltServer versions stay in sync.

If AltServer cannot reach the Mail plug-in, you may see separate error codes such as 2014, so keeping both pieces running prevents a whole chain of messages.

Enable Wi-Fi Sync In Finder

Finder replaces iTunes for device sync on recent macOS versions. AltStore needs the same Wi-Fi sync setting that Finder uses to see your device when the cable is unplugged.

• Connect By Cable — Plug the iPhone or iPad into the Mac and unlock it.
• Open Finder — Click your device under Locations in the sidebar.
• Turn On Wi-Fi Sync — In the options area, tick “Show this iPhone when on Wi-Fi” or the same phrase for your device type, then click Apply.
• Test Over Wi-Fi Only — Unplug the cable, wait a short while, then refresh apps through AltStore while AltServer stays open.

If refresh works when a cable is attached but fails on Wi-Fi, this Finder setting is often the missing link.

Check macOS Firewall And Network Filters

macOS can also block AltServer traffic if the built-in firewall or a separate security tool filters incoming connections. The fix mirrors the Windows approach: allow AltServer on your home or office network.

• Open Security Settings — Go to System Settings > Network > Firewall and look for an entry for AltServer.
• Allow Incoming Connections — Set AltServer to “Allow incoming connections” so Bonjour and local discovery can reach it.
• Review Third-Party Filters — If you use extra security apps or VPN clients, add AltServer to their allow lists as well.

Once AltServer is visible on the local network without interference, AltStore usually picks it up the next time you try a refresh.

Network And Router Settings That Block AltServer

Even when your own devices are set up correctly, the Wi-Fi network itself can stop discovery. Many routers and managed networks include options that keep devices from seeing each other, which breaks the Bonjour traffic AltServer uses.

• Avoid Guest And Public Wi-Fi — School, office, hotel, and café networks often use client isolation, which prevents your phone from reaching your computer at all.
• Watch For AP Isolation — Some home routers have “AP isolation” or “client isolation” switches that keep wireless devices separate. Turn those off for the network where you run AltServer.
• Keep Devices On The Same Subnet — If your router broadcasts multiple network names or separates 2.4 GHz and 5 GHz into different segments, try placing both the phone and computer on the same band.
• Try A Personal Hotspot — A quick workaround is to connect your computer to the iPhone’s hotspot and join the iPad, if any, to that hotspot as well. With all devices on one small network, discovery often works straight away.
• Avoid Conflicting VPN Settings — VPN clients on the computer can sink local traffic. Pause the VPN while you refresh AltStore, then reconnect once you are done.

These network tweaks matter most when the error only appears on one Wi-Fi network but not another. If AltStore works at home yet fails on campus, the local rules there are almost always the cause.

Simple Habits To Prevent Future Errors

Once AltStore and AltServer talk to each other again, a few small habits will keep weekly refreshes smooth and reduce repeat errors.

• Launch AltServer At Startup — Add AltServer to your Mac or Windows startup items so it runs quietly in the background whenever the computer is on.
• Leave Helper Apps Signed In — Keep iTunes or Finder and iCloud signed in with the same Apple ID you use in AltStore so authentication never fails mid-refresh.
• Refresh On A Trusted Network — Pick one stable home network for refresh days instead of switching between public hotspots with strict rules.
• Keep AltStore And AltServer Updated — When you see new releases, install them so error codes tied to older versions do not linger.
• Use USB For Emergency Refreshes — If Wi-Fi acts up close to an expiry date, plug the device in with a cable, run a manual refresh, and sort out Wi-Fi later.

With AltServer set up carefully on your computer and a predictable network routine, the “AltServer cannot be found” message should turn from a regular headache into a rare, short-lived warning that you can clear in a few steps.

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