Synchronizing Error

I was using Zotero before, but only set up an account and bought some storage recently. When trying to synchronize I get the following errors:

sync.zotero.org : server does not support RFC 5746, see CVE-2009-3555
api.zotero.org : server does not support RFC 5746, see CVE-2009-3555
api.zotero.org : server does not support RFC 5746, see CVE-2009-3555

Has someone made some experience with this problem?

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