After you "Open Site" in Frontpage 2003 & connect to your site, everthing looks OK & all the folders & files are displayed. However as soon as you try to open a file ( page) you get an error message

Error Retrieving "File name"  the connection timed out or was aborted by the server

 Before you go nuts , turn of whatever flavor of Symantec Endpoint security or Symantec Anti Virus you are runing.

It will probably fix your problem , let us know.