what version of eCart?
Check with your host to make sure that the msxml3.dll library on the server is up to date.
it sounds to me like the server is somehow limiting the number of connections that can be made using the msxml3.dll library.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.