I was receiving this error on the "Report Server Web Service URL" on our SharePoint farm:
Report Server has encountered a SharePoint error. ( rsSharePointError)
Access to this Web Site has been blocked. Please contact the administrator to resolve this problem.
This site URL is configured via Central Administration > Configure Reporting Services Integration > Reporting Services Integration if Reporting Server feature/Add-in is installed on the farm.
After doing some research I found out that this page somehow enumerates through entire site collections before it throws this error. As part of troubleshooting step I checked if the domain user configured for reporting service is has sufficient privileges in the farm and also as local admin of the sql box, but this did not solve the issue.
We raised this issue with the vendor and they made us update our SQL Server 2005 to latest SP and CU; still we had the error. The reason was nobody was sure if this error was related to MOSS or SQL server. We checked the reporting services log files but could not find much details on this error. Finally the vendor looked up his case archives and found that this error could occur if site collections are locked or set as No Access in Quotas and Locks page in Application Management. I ran the following command to check on the lock status of site collections of each web application:
stsadm –o enumsites –url -showlocks
We found out that there were couple of sites locked in mysites web application and I unlocked these sites. Then I navigated to the Report Server Web Service URL and I did not get the error, instead I saw a list of sites. I assume these sites are the ones which have reports deployed. I checked with the vendor who was working with me on this but they could not tell me the logic behind what sort of sites were populated in that page.
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