Can this question be resolved as I have found the solution.
Had to phone Microsoft in the end.
This issue only occurs when you use SQL reporting 2008 and an SSL certificate.
Solution is below:
Problem
========
Cannot upload RDL file to SSRS using Report Builder 2.0.
Environment
============
Windows 2008 SP1
SSL is used.
Possible Root Cause
===================
The default request size of 16kb is not large enough to contain the full HTTPS request before the certificate is fully processed.
Since we try and flush the buffer but the cert is not fully negotiated the web server will tell the client to close the connection.
Suggested Resolution
====================
1) Add the registry key called "MaxRequestBytes" to "HKEY_LOCAL_MACHINE\System
NOTE! One report I found said to set the value to 0n5242880 and another report said to set the value to 5242880 (without the leadin 0n).
You might want to try the second one as well should not the first resolve the issue.
2) Stop the SRS Service from Reporting Services configuration manager
3) Stop the HTTP service by typing "net stop http" from the command prompt.
4) Start the HTTP service by typing "net start http" from the command prompt.
5) Start the SRS service
6) Try uploading the Report from the report manager.
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by: CGLuttrellPosted on 2009-04-28 at 11:52:51ID: 24253891
Found a couple links that might be helpful:
http://sharepoint2009.blog
http://www.experts-exchang
Maybe one of them will put you on the right track. Not a lot of folks are into Report Builder yet and this sounds like a configuration or secruity issue. Good luck.