Hello again, For the sake of those who encounter the same issue and come across this thread, I tracked it down to a configuration issue in rssrvpolicy.config.
Short and dirty answer: Change the PermissionSetName attribute from "Execution" to "FullTrust" for CodeGroup "Report_Expressions_Default_Permissions". A better solution is to only grant specific permissions for this code group based upon your log4net appender requirements. Unfortunately, log4net's internal logging wasn't much use, but it wasn't it's fault; even though the log4net assembly had been granted full trust, the report expression host which referenced it didn't. Finally, this is off-topic but relevant: I ran into obscure issues when valid xml comments (e.g. <!--foo--> ) were placed in rssrvpolicy.config; so just take a backup of the file instead of commenting out particular elements. Here's the exception I got from Report Server or Manager: Exception information: Exception type: HttpException Exception message: Could not load file or assembly 'ReportingServicesWebServer, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. Failed to grant permission to execute. cheers si -- It's a wild world that we live in, you step to the vibe like a new found religion, take your position, compile your vision, futurism, algorithm has risen up! pfm - the western