Maybe you have a wordpress plugin installed that uses spamhaus which blocks access to your server from that ip? Can't imagine that your host is blocking these ips for you for web access, if that's true, you'd better look for a better host. Access to panels is sometimes also blocked, due to login attempts. Is your access also blocked on your normal site or just the panels. Sometimes these panels run on ports other than 80, these other ports are sometimes also blocked by wifi routers or whatever.
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