SPSite API throw error - Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application

Hi ,

I have created one service which is installed on same machine where SharePoint Server (Farm) installed . for service developed used SharePoint Server object Model API (e.g SPSite,SPWeb) . this service call through other application i observed two case when i installed service on different machine -

1. SharePoint standalone server - everything is work fine when i impersonate code with site collection administrator . even Service context keep it as Local System . doesn't matter what is the context of service.

2.SharePoint Farm - Same above scenario but i need to set service logon context as farm Administrator otherwise it throw error as i mentioned in question

Is any specific reason to i got this error on farm environment only . Is any option available , rather than set service context set as SPFarm admin.

thanks in advance