Does the harbor map support DM ? Been too long for me to recall about UO. And make sure that the correct set of map files are on the gameserver for mp_harbor - my bad, thats a stock map aint it ? In any case, compare your games' mp_harbor to the gameserver files - mp_harbor came in a map pak which would be an update - is the gameserver updated ?
CALL OF DUTY™ UNITED OFFENSIVE™ 1.51 PATCH README
Last Updated: 2004-12-10
INTRODUCTION & IMPORTANT NOTES
- Added ability to execute map and gametype specific config files. When a map is loaded on the server, a config by the name of <mapname>_<gametype>.cfg will be executed automatically, if it exists. If it doesn't exist, then it will be ignored. Eg. mp_foy_dom.cfg will be automatically run when mp_foy is started in Domination mode.
- Can specify a config file to execute within the sv_mapRotation command. For example, “sv_mapRotation exec mycfg1.cfg map mp_foy exec mycfg2.cfg map_kursk”. (Note: doing this will override the <mapname>_<gametype>.cfg and prevent that config from being executed.)