When you browse Report Manager URL, you get an HTTP 500 error or a blank page (in case if you have disabled friendly HTTP messages) on the browser window. When you check the Reporting Services log files you would find the below error being logged:
ERROR: System.Web.HttpException: Error executing child request for Error.aspx. —> System.Web.HttpUnhandledException: Exception of type ‘System.Web.HttpUnhandledException’ was thrown. —> System.InvalidOperationException: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms.
This is happening because FIPS is enabled on the Reporting Services server and Report Manager does not support the Local Security Policy “System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing”.
To ascertain that FIPS is enabled you can:
(1) Check the registry key:
And the value of it should be set to 1.
(2) Or else, go to Local Security Policy (Start -> Run -> secpol.msc) and then go to “Security Settings -> Local Policies -> Security Options” and on the right-side windows you should see the policies in that please look for the Policy “System cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing” and checked the security thing and it should be Enabled.
How to resolve the issue?
If you do not need FIPS, go ahead and change the above mentioned registry change from 1 to 0 or else change the local security policy from Enabled state and Disabled state.
If you cannot disable FIPS, the following link is another way to work around it. With reference to https://support.microsoft.com/en-us/kb/911722, in order to get around this issue you would have to edit Report Manager’s web.config file as explained below.
File to be edited:
<system-drive>\Program Files\Microsoft SQL Server\MSRS<version>.<instance>\Reporting Services\ReportManager\Web.config
What to do?
(1) In the Web.config file, locate the <system.web> section.
(2) Add the following <machineKey> section to in the <system.web> section:
<machineKey validationKey=”AutoGenerate,IsolateApps” decryptionKey=”AutoGenerate,IsolateApps” validation=”3DES” decryption=”3DES”/>
(3) Save the Web.config file.
Once the file has been changed, you would have to restart Reporting Services service for the change to become effective.
Recommendation: Take a backup of the web.config file prior to making the change.