The server seems to be up to me. Your sites being unreachable could be anything–not necessarily an entire server being down.
What is the domain name that you can’t reach?
Pinging apu.dreamhost.com [22.214.171.124] with 32 bytes of data:
Reply from 126.96.36.199: bytes=32 time=65ms TTL=46
Reply from 188.8.131.52: bytes=32 time=79ms TTL=46
Reply from 184.108.40.206: bytes=32 time=64ms TTL=46
Reply from 220.127.116.11: bytes=32 time=67ms TTL=46
Ping statistics for 18.104.22.168:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 64ms, Maximum = 79ms, Average = 68ms
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