Cannot connect Zotero standalone to internet

[JavaScript Error: "sync.zotero.org:443 uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown.
The server might not be sending the appropriate intermediate certificates.
An additional root certificate may need to be imported.

Error code: SEC_ERROR_UNKNOWN_ISSUER
"]
[JavaScript Error: "Error connecting to server. Check your Internet connection." {file: "chrome://zotero/content/xpcom/sync.js" line: 2595}]
[JavaScript Error: "Error connecting to server. Check your Internet connection." {file: "chrome://zotero/content/xpcom/sync.js" line: 652}]
[JavaScript Error: "repo.zotero.org:443 uses an invalid security certificate.

The certificate is not trusted because the issuer certificate is unknown.
The server might not be sending the appropriate intermediate certificates.
An additional root certificate may need to be imported.

Error code: SEC_ERROR_UNKNOWN_ISSUER
"]

version => 4.0.29.17, platform => Win32, oscpu => Windows NT 6.1; WOW64, locale => en-US, appName => Zotero, appVersion => 4.0.29.17, extensions => Zotero LibreOffice Integration (3.5.12.SA.4.0.29.17, extension), Zotero Word for Windows Integration (3.5.6.SA.4.0.29.17, extension), QuickTime Plug-in 7.7.4 (7.7.4.0, plugin), Adobe Acrobat (11.0.4.63, plugin), Google Update (1.3.33.5, plugin), Microsoft Office 2013 (15.0.4514.1000, plugin), Silverlight Plug-In (5.1.50906.0, plugin), Microsoft Office 2013 (15.0.4849.1000, plugin), Java(TM) Platform SE 8 U131 (11.131.2.11, plugin), Java Deployment Toolkit 8.0.1310.11 (11.131.2.11, plugin), Shockwave for Director (12.0.4.144, plugin), Shockwave Flash (11.7.700.169, plugin)

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