Sun Cobalt machines contain a firewall mechanism, this mechanism can be configured remotely by accessing Cobalt's built-in HTTP server. Upon access to the HTTP server, a java based administration program would start, where a user is required to enter a pass phrase in order to authenticate himself. Since no username is required, just a passphrase bruteforcing of this interface is easier.

Access to this port (by default set to port 8181) should not be permitted from the outside. Further access to the firewall interface itself should not be allowed (by default set to port 2005).