Request timed out

I was testing a webpart and got the next message error

Server Error in '/' Application.Request timed out.Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Web.HttpException: Request timed out.Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.Stack Trace: [HttpException (0x80004005): Request timed out.]

After try changes on many timeouts configuration files, it finally worked with the httpruntime executiontimeout located at the machine.config file.