I'm having the same issue! As directed I opened http://127.0.0.1:23119/connector/ping... and it says zotero connector is available...but the chrome extention is still saying that its offline???

I am having the same issue and none of the solutions on the linked page are working for me. In addition I am unable to submit an error report through the Chrome Zotero extension. When I try, I get the following error message:

" An error occurred submitting your error report.
HTTP request to https:/www.zotero.org/repo/report rejected with status 0
Please check your Internet connection. If the problem persists, please post a message to the Zotero forums."

I have disabled my antivirus program, and I have checked and unchecked all my browser extensions. In addition, the problem arises only on my work machine — everything works fine at home where I am using the same browser and the same extensions. So it must have something to do with the way my work network is directing the request, yes?

One more piece of information: I have no difficulty connecting to http://127.0.0.1:23119/connector/ping. When I try, the response is "Zotero Connector Server is Available."

Any suggestions? For now, my workaround response is to use Zotero only at home.

It was not another extension, because [1] it works fine on my laptop and home machine with the exact same extensions installed, and more importantly [2] I finally thought to uninstall and reinstall Zotero Connector, and the problem went away – even with all the same extensions active.

Next time I'll try that first [and you might add that to your list of of possible fixes at https://www.zotero.org/support/kb/connector_zotero_unavailable.] Thanks.