In the Configuration Centre next to each configured service. The Edit option will not appear until the service is stopped.
When I stop the Data Import service the only options to edit is the 'Service Desk Framework Url', 'Logon to Service Desk as' and 'Log severity'. Where can I adjust the WebServiceTimeout for the Data Import Service?
For the Data Import service this setting is actually taken from the wrong file anyway. Take a look at this document for details: Nothing is imported (0 items found) on a data import with a very large amount of source data..