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@DavidR
I have no other security sw in use. I'm not sure but I think the transfer is via FTP.
It must be something in avast, as when I stop all services the upload then work
That is the problem with conflicts, remove one element and no conflict and what it doesn't do is identify which is the true culprit. Given that you haven't had this happen with avast before and the avast program has not been updated since February nothing has changed that could even possibly cause this.
So when did this start to happen and what changed around that time ?
e.g. has SugarCRM changed recently as if it is using the HTTP port (80) to upload and download files it must use strict http protocol...
As Tech said the web shield shouldn't monitor outbound http connections.
What exactly are the issues you first mentioned, are there any errors, etc. displayed ?