Strange server, but definitely reachable via IPv4. IPv6 is 3 of 4 (maybe the reason for Bad Gateway errors)
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C:\>ping download.sysinternals.com -4
Pinging cs9.wpc.v0cdn.net [93.184.221.200] with 32 bytes of data:
Reply from 93.184.221.200: bytes=32 time=30ms TTL=57
Reply from 93.184.221.200: bytes=32 time=21ms TTL=57
Reply from 93.184.221.200: bytes=32 time=25ms TTL=57
Reply from 93.184.221.200: bytes=32 time=35ms TTL=57
Ping statistics for 93.184.221.200:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 21ms, Maximum = 35ms, Average = 27ms
C:\>ping download.sysinternals.com
Pinging cs9.wpc.v0cdn.net [2606:2800:133:206e:1315:22a5:2006:24fd] with 32 bytes of data:
Request timed out.
Reply from 2606:2800:133:206e:1315:22a5:2006:24fd: time=23ms
Reply from 2606:2800:133:206e:1315:22a5:2006:24fd: time=29ms
Reply from 2606:2800:133:206e:1315:22a5:2006:24fd: time=26ms
Ping statistics for 2606:2800:133:206e:1315:22a5:2006:24fd:
Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
Approximate round trip times in milli-seconds:
Minimum = 23ms, Maximum = 29ms, Average = 26ms
C:\>
The other server probably blocks ICMPv4 and is IPv4-only.
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C:\>ping live.sysinternals.com
Pinging live.sysinternals.com [191.236.128.229] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 191.236.128.229:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
C:\>
Looks like server to be used is a case of one's own location, after all. The global net is a complex beast...
Ping for the General Failure address above:
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C:\>ping 72.21.81.200
Pinging 72.21.81.200 with 32 bytes of data:
Reply from 72.21.81.200: bytes=32 time=201ms TTL=50
Reply from 72.21.81.200: bytes=32 time=131ms TTL=50
Reply from 72.21.81.200: bytes=32 time=153ms TTL=50
Reply from 72.21.81.200: bytes=32 time=151ms TTL=50
Ping statistics for 72.21.81.200:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 131ms, Maximum = 201ms, Average = 159ms