My setup:
- MOSS 2007 and SSRS 2008 installed on vmsp-01
- SQL Server 2008 installed on vmsql-01
There are several reasons for getting the following message:
An unexpected error occurred while connecting to the report server. Verify
that the report server is available and configured for SharePoint integrated
mode
The main reason for getting this error will be that you have configured Reporting Services in Central Administration to point at a localhost URL. However you might have checked all your settings (as I had) and been fairly sure they were right. Mine were as below
Now, as this was testing, the url is not in DNS (and to be honest, I've no intention of cluttering DNS with another record). I'd modified the hosts file to point at this.
What you might find at this point is that you can access the URL from external machines (with the right host headers in the hosts file), but you cannot access the url from the server itself. You've fallen foul of "as designed. If you cannot connect to any *windows authenticated* URL hosted on the server from the server itself, and you are receiving the error message above, then it is the loopback adapter that is at fault. As the SharePoint server makes the second request to retrieve data from the reporting server it makes no difference if you can access the reporting server url correctly from a client machine
Disabling the loopback adapter solves the problem. I think that having a DNS record probably fixes this issue too, but I've not checked for sure.
Installing SSRS for SharePoint Integrated Mode
Disabling Loopback Adapter in Windows Server 2003 R2 and Windows Server 2008/Vista
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