yes, I'm still unable to sync.

the sync arrow-icon in zotero keeps rotating without any changes in my library.

I've actually performed a fresh reinstall of firefox
(w/ no prior personal config) yesterday, and left firefox on w/ zotero syncing since that afternoon.

The library on zotero hasn't changed since I reinstalled firefox/zotero.

Should I contact you again if it still hasn't finished syncing by tomorrow?

I'm still having trouble syncing, received an error this morning
"Error connecting to server. Check your Internet connection"
and submitted an error report (Report ID: 1033634766).

I hope this helps you figure out what the problem is.

OK, no guarantees, but try again now (and then wait 1.5 hours for it to finish).

Just to explain what's going on here, somehow your client did a full reset that caused it to redownload all data from all your libraries, which generally shouldn't happen but can under a few rare situations. You have a huge number of items between all your libraries, though, and that's causing the download attempts to time out. I may have fixed the timeouts now, however.

We'll be switching to a new syncing architecture in Zotero 4.1 that will allow library data to sync in much smaller portions, which should help avoid issues like this. In the meantime, we'll get this to go through, one way or another.

It still hasn't sync'd on my end,
and received an error message:

"Empty response from server.Please try again in a few minutes."

I submitted another error report: Report ID 1757613135

I actually thought that this might have been the culprit too, so

I unchecked all of the boxes under "Proxies" in Zotero Preferences, Firefox is using system proxy settings, and my system setting is set not to use a proxy.

It's still giving me the same error message every time I try to sync.

The settings in Proxies wouldn't matter, but a system proxy would. If that's disabled that shouldn't an issue, though.

It's definitely working on our end at this point. It's using a cached download and taking about 15-30 seconds each time. But this is 87MB of data, so it's entirely possible you're running into some sort of network glitch, or that Firefox is failing on a request that large.

It probably won't help, but you could try installing Zotero Standalone, which will share your existing Zotero data directory by default, and syncing with that.

If you can't get it to go through, it might help to remove items from the trash on the server. (Doing it in the Zotero client on your current computer won't help, and you shouldn't do so.) On the website you can currently only delete items permanently one page at a time, which might take a long time. If you have another Zotero client that is in sync, you could empty the trash there and sync. If not, I can help clear out your trash on the server.

OK, cleared, but before I let this download go through, could you just confirm the number of non-trashed items—including child items, as explained on that page—in your local personal library? I want to make sure it matches what's on the server.

OK, well, the smaller download went through (twice). I don't suppose things are any better on your end?

(I could also delete items from the trashes in your group libraries, though there may not be enough to make a difference.)

I'll try to make a habit of clearing this out myself in the future.

You don't need to in general. Items are deleted automatically after 30 days. (It can't hurt if you know you've deleted a lot of items, though.)

Great. Sorry for the hassle. Again, this sort of problem is part of the reason we're switching to a new sync architecture in Zotero 4.1.

erikaparn: https://www.zotero.org/support/kb/connection_error

If you're still having trouble, please start a new thread. (This one is 3 years old and unrelated.)