Unexpected status code 307 for request 0/D266WX9K in Zotero.Sync.Storage.ZFS.downloadFile()

Can you restart Zotero and provide a Debug ID for a sync attempt that triggers an error (or that stalls, if for some reason you're not getting a sync error icon)?

Are you connecting through some sort of proxy server? You're getting a 307 response code, which isn't something we return. It might be something Amazon (our cloud storage provider) returns, but I don't think we've ever seen this before, so it's more likely something on your network.

Resetting data has nothing to do with your issue — which is about file syncing, not data syncing — and the reset options aren't meant to be used for troubleshooting.

This is almost certainly being caused by your proxy server.

I'd guess that the proxy is trying to redirect you to a login page, which won't work in Zotero Standalone. If you normally have to log in to your proxy server via a web browser (instead of a pop-up authentication dialog), you should use Zotero for Firefox instead.

Here is the debug ID in firefox... D1433055511

Hello Dan,

Unfortunately, I can't connect without any proxy on this computer.

Thx

Ken

Can you grab the 4.0 Beta and generate another Debug ID with that? It might give us a bit more info on what's happening.

I'm afraid that doesn't help.

We've never seen a 307 being returned, so I have to think that this is being caused by your proxy server, but I'm actually not clear why that's resulting in an error, since a 307 redirect should be handled automatically by the Mozilla network code — and it is in my testing. So the only other thing I can think of is that this is actually being caused by the local disk instead. If possible, can you try copying your Zotero data directory to your local hard drive, pointing Zotero at that, and syncing to there instead? (First make a note of your current data directory location so that you can revert it later if necessary, and also, for good measure, temporarily disable auto-sync in the Sync pane of the preferences, to avoid an accidental full sync in case you don't get it right on the first try.)

I'd recommend trying this in Standalone, which is somewhat less likely to be affected by security software. (You're also running an outdated version of Firefox.)

I'd discourage you from trying to troubleshoot yourself based on the debug output — you're deleting files at random that have nothing to do with the issue, which clearly still exists. (Also, the error is about downloading, not uploading, so I'm not sure why you're deleting files that don't exist remotely.)

In any case, I can't help you further on this until you try syncing this library without the proxy. If you can't do it on that computer, you can copy your data directory to a portable disk, connect it to another computer, point Zotero on that computer to the portable disk (or copy the contents to that computer), and try syncing with that. The data directory includes the entire sync state, so the sync would pick up at exactly the same spot. If you can reproduce this on another computer that's not connected via a proxy, I can look further. Otherwise, I have to assume that this issue — which, again, we've never seen before — is being caused by your proxy server.

If this worked on another network, there's clearly a problem with your proxied network connection. You might have better luck switching file syncing to "as needed" mode in the Sync pane of the Zotero prefs rather than trying to sync all files at sync time. That's about all I can suggest.