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Is it the router being pinged or the proxy?
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Wouldn't be the proxy? That only affects port 80 TCP connections outbound from the PC. We're talking ICMP echo requests inbound to the modem/router, here, which don't go near the proxy. We'll know your modem's IP and router's IP (if you have a router connected) and can therefore ping them both. The modem will always reply if it's online, but the PC router may reply (in which case you know it's online) or may not (in which case you can't assume it's offline, since it might be firewalled).