sync not working

ravid.ekshtain
can not sync. cna you tell me why ?

JavaScript Error: "HTTP HEAD http://zotero.org.s3.amazonaws.com/proxy-auth failed: Unexpected status code 0" {file: "chrome://zotero/content/xpcom/http.js" line: 525}]

[JavaScript Error: "Error connecting to proxy -- proxied requests may not work"]

[JavaScript Error: "Error connecting to server. Check your Internet connection." {file: "chrome://zotero/content/xpcom/sync.js" line: 652}]

[JavaScript Error: "Error connecting to server. Check your Internet connection." {file: "chrome://zotero/content/xpcom/sync.js" line: 652}]

[JavaScript Error: "Error connecting to server. Check your Internet connection." {file: "chrome://zotero/content/xpcom/sync.js" line: 652}]

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