by Alain Raap.
We have a problem with making a backup without a progress bar being shown. The Waiting time (TTFB) is very high, nearly as much as the time of the backup. When the backup is nearly finished a progressbar is shown or the message that the backup is ready. In the meantime the webpage remains unchanged (I can see the request is in progress).
This behavior is not the case in every backup test and on different networks. Could it be a problem with our firewall that blocks the response of this specific backup process?