Remote reboot product with built in firewall?

Hi, I am a user on cyberspace.org, a free shell box. It freezes from
time to time due to DOS attacks and we are planning to purchase some
sort of remote-reboot device. Do you guys know of any device that
comes with a built-in firewall. We were considering a APC MasterSwitch
- 10A device, with IP connectivity of some sort. The problem is that
the MasterSwitch will then be open to DOS attacks.

Could you guys suggest a device, some sort of master 250V power
switcher thingy, that is reliable, with no moving parts, no fire risk,
with a built in firewall which can be configured to allow a trusted
host to connect and configure it, which can be used to restart the
main cyberspace.org box, and it should act like a bridge and relay the
rest of the packets to cyberspace.org.

ISP <-> Master250VPowerSwitcherThingy+Firewall+Transparent Bridge <->
Cyberspace.org