Web Service is not running

Hi

i am tring to understand why a ws is running and the with no reson stop refreshing the data

sometimes i see the initial data saved from rich client and after few times tring to refresh it disapears

even the most simple query like "select x from y"

creating a 1 collumn table in richclient with no prompts does not show the data

i am sure the authentication is correct becuase i have a ws that do run with the same parameters

i can not find a logic for these issues

maybe it has something to do with names

thanks

Eyal