Webservice Issue / Application Pool - Network Indentity

[thedom2]

Hi All I have a web service that was not working and bringing up the dreaded internal server error page. I have this web service working on another server so i know code wise it works but could not get it to work on my new server. I tried other web services on my new server and they work fine. Just not this particular one. i changed the network indentity to local system in the application pool and the web service works so was hoping someone had any clues where i should look to fix this issue as i dont want it running under the local system identity. one last thing this webservice uses a com object. any help appreciated cheers