HTTP 503 Service Unavailable Error in SAP XI 3.0
I am doing a simple File -> File scenario which picks up a .txt file from a folder and post it to the same folder .My file is getting picked up.But I am getting an error
<SAP:Stack>HTTP response contains status code 503 with the description Service Unavailable Error when sending by HTTP (error code: 503, error text: Service Unavailable)</SAP:Stack>
I have done a cache refresh to resolve this error. But then my error is MAPPING PROGRAM NOT FOUND.When I retry I am getting the HTTP 503 error.
Please suggest any solution for the same .