The zoneserver may be coughing up when it brings up poearthb.
Bring up poearthb in a static zone
Get to a command prompt, and give the command:
zone.exe poearthb aaa.bbb.ccc.ddd port www.xxx.yyy.zzz
Substituting the correct IP and port where necessary.
See if booting up the zone gives any gripes. If so, post the output here.