rsReportServerDatabaseUnavailable on Reporting Services

Today i wanted to publish some reports i have designed for Microsoft SqlServer Reporting Services and i begin to experiment some errors.

I got the error that server doesn't exist or access is denied.

The report server cannot open a connection to the report server database. A connection to the database is required for all requests and processing. (rsReportServerDatabaseUnavailable) Get Online Help
SQL Server does not exist or access denied.

Before two hours i realized that the server ip had changed, so that affected the Reporting Services Configuration.

I firstly solved it modifying my Hosts file a c:\windows\system32\drivers\etc with the new ip number.

Then i found that it can be solved with the rsconfig Utility

You can read its usage at

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/RSUIREF/htm/cpu_rsconfig_v1_5f1e.asp?frame=true

So that i left my hosts file as was, and tested the solution with the rsconfig utility.
I opened the Command Prompt

and executed a line like this

rsconfig -c -sMyServerName -dReportServer -awindows -uDomain\Account -pMyPassword

And all becomes working fine.