> - what is that 'operation' that hangs?

its a TAstaClientDataSet.Post

> - does the network connection still work? (ping?)

yes

> - what does you connection string look like?

as i said, its 3-tier app, so there is no direct connection
between server and client. app server connection string is like
IP:C:\MyDB.GDB

> - does the 'hanging' end at some point? do you get some error

message then?

nope, it takes forever.

> - are you able to connect to remote server with an admin tool while the
> application is hung?

yes