I’m getting a LocalSend error 500 whenever I try to send files between devices on my local network. It was working before, but now every transfer fails and I’m not sure if it’s caused by the app, network settings, or a recent update. I need help troubleshooting this LocalSend error 500 so I can get file sharing working again.
LocalSend Error 500, what it usually points to
I ran into this a few times, and the message in LocalSend did not tell me much. Error 500 usually means the app failed somewhere while setting up or handling the transfer. It is a broad internal error, so you do not get one clean reason from the code alone.
From what I saw, it often shows up when the link between both devices drops for a moment during setup, or when the receiving device stops accepting the request out of nowhere.
Stuff that tends to trigger it
The pattern was pretty clear for me. I saw Error 500 after switching Wi-Fi, turning on a VPN, or leaving the receiving phone idle until the screen locked. Firewalls and antivirus tools also get in the way more often than people think.
Another one, temporary transfer junk. After a failed send, or after moving a big file and having it break halfway through, the next attempt sometimes crashes into the same error again.
What I’d try first
The fast fix is boring, but it worked more than once for me. Close LocalSend on both devices. Open it again. Put both devices on the same Wi-Fi. Keep the app open and visible during the transfer instead of letting it sit in the background.
If you still get the error, go through this:
- Turn off any VPN for a minute
- Pause firewall or antivirus filtering for testing
- Reconnect both devices to Wi-Fi
- Send a small file first, then retry the larger one
- Install the latest LocalSend update
On Android, I’d check storage permission first. If it got revoked, transfers fail in weird ways. On macOS, look in Privacy & Security and make sure local network access for LocalSend is still allowed. I missed this once and wasted like 20 mins on it. typo on my part, not the app.
If it keeps happening over and over
When Error 500 keeps coming back with large files, I would look at the network before blaming the file. Weak Wi-Fi, mesh setups with awkward handoffs, or strict security software often break the connection long enough for LocalSend to give up.
I’ve also seen people move large transfers over USB instead, mostly on macOS, because wireless gets flaky fast with bigger files. One option people mention is MacDroid, which tends to hold up better for long file copies.
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Error 500 in LocalSend often points to the receiver rejecting the upload path, not only the network. I’d check the save location first.
A few things I’d test, since @mikeappsreviewer already covered the common Wi-Fi and firewall stuff:
-
Change the receive folder on the target device.
Sometimes the folder was moved, deleted, or became read-only. Pick Downloads or Desktop and retry. -
Check free space on the receiving device.
Big transfers fail with a generic 500 if storage is low. Leave more room than the file size, not less. -
Rename the file.
Odd filenames, long names, or special characters break some transfers. Try a short name like test.mp4. -
Send one file, not a folder.
Folder transfers fail more often if one item inside has a bad name or permission issue. -
Clear LocalSend app data or cache.
Not only restart. Resetting the app helped me when it got stuck after an update. You’ll need to re-allow permissions after. -
Check date and time on both devices.
If one device has the wrong clock, local app handshakes sometiems fail in weird ways. -
Try device A to B, then B to A.
If one direction fails every time, the issue is on the receiving side.
If you’re moving big files to a Mac often, I’d skip fighting Wi-Fi for hours and use MacDroid over USB. It’s more stable for large copies and way less annoying. LocalSend is great when it works, but error 500 is one of those vague app errors where the real cause is often storage path or file handling, not the network.
I mostly agree with @mikeappsreviewer and @reveurdenuit, but I would not assume Error 500 is always “network weirdness.” In LocalSend, I’ve seen it happen when device discovery works fine, but the actual transfer session breaks because one side is advertising an old local IP.
That can happen if one device changed networks recently, woke from sleep, or swapped between 2.4 GHz and 5 GHz on the same router. Looks connected, still fails. So I’d specifically do this:
- forget and reconnect Wi-Fi on both devices
- disable “private Wi-Fi address” or similar temporary MAC/randomization setting just for that network
- restart the router, not just the app
- check whether either device is using cellular fallback while Wi-Fi is weak
Also, test by opening LocalSend’s web share or pinging the target device locally if you can. If the devices can “see” each other but the port is stale/blocked, that points more to network session issues than permissions.
One more thing people skip: try a different file type. If JPG sends but MKV/PDF does not, sometimes the OS share sheet or file provider is the broken part, not LocalSend itself. Seen that on Android file managers more than once.
If you keep hitting this on Mac with larger transfers, honestly MacDroid is worth a look for USB transfers. Less elegant, more stable. Sometimes boring wins lol.