We could receive the above errors while trying to connect to the reporting server from SQL server management studio or while importing organization using Deployment Administrator.
The following changes resolved the issue
Go to reports server’s config file
1) C:\Program Files\Microsoft SQL Server\MSSQL.3\Reporting Services\ReportManager\RSWebApplication.config
<ReportServerUrl>http://servername/ReportServer</ReportServerUrl>
<UrlRoot>http://servername/reportserver</UrlRoot>
Change https to http
2) C:\Program Files\Microsoft SQL Server\MSSQL.3\Reporting Services\ReportServer\rsreportserver.config
<Add Key="SecureConnectionLevel" Value="0"/>
Change the Value from 2 to 0
Verify the 3rd step as well
3) In IIS, right click the web site –> properties –> Directory Securities –> Authentication and access control –> Edit
Disable the anonymous access
bye..
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