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  • Plugin Author Duo Security

    (@duosecurity)

    Yes, this looks like a firewall issue.

    The error indicates a problem connecting to https://api-0200d496.duosecurity.com, ie. (currently) 54.241.191.167 on port TCP 443

    Note that your API Hostname can change to a different IP address at any time. We advise allowing outbound connectivity to all IPs on TCP port 443. If this is too open for you, email [email protected] for a list of IP ranges which your API hostname could change to.

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