I got this error when installing TFS2010 on my box:

[ Reporting ] TF255455: SQL Server Reporting Services is configured to require a secure connection. However, no HTTPS URL is configured with a valid certificate. Use the Reporting Services Configuration Manager to configure or remove HTTPS support.

I tried to Bing it. Then I found out I’m not the only one has this issue. Here is the solution from Disable the requirement on the secure connection for Reporting Services.

Briefly on the following:

This issue is happening due to the way SQL RS enables (and enforces) HTTPS on a machine. If the SQL installer finds any certificates on the machine with the purpose set to * (anything) or server authentication it will set the SQL RS SecureConnectionLevel to 2, which requires HTTPS. (This can happen in a few other scenarios too, but this is the common one) So even though you may not have intended for RS to use SSL in this case, it is trying to enforce it.

C:Program FilesMicrosoft SQL ServerMSRS10.Reporting ServicesReportServerrsreportserver.config

<Add Key=”**_SecureConnectionLevel” Value=”2”/> (Change from current value to 0) This will disable SSL for SQL RS._**

Here is what the values mean:
3 Most secure—Use SSL for absolutely everything.
2 Secure—Use SSL for rendering and methods that pass credentials but don’t insist on it for all SOAP calls.
1 Basic Security—Accepts http but rejects any calls that might be involved in the passing of credentials.
0 Least Secure—Don’t use SSL at all.