wcf - Reporting Services LocalReport and WIF -

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i have wcf webservice uses wif authentication. part of responsibility of webservice generate report , email it. if render report data fine. if include report parameters, report constants, or datetime.now following exception: 

an error occurred during local report processing.failed load expression host assembly. details: request permission of type 'system.security.permissions.securitypermission, mscorlib, version=4.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089' failed

i can run same report in wcf service not use wif, security environment fubarred.

i don't know how proceed solving problem. can help? thanks!

this works:

var reportinstance = new localreport(); reportinstance.setbasepermissionsforsandboxappdomain(new permissionset(permissionstate.unrestricted));

i don't understand why. understand report being granted permissions can't wif, don't understand permissions or why needs them. so, answer "gives man fish," can else "teach man fish" explaining deeper issue?


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