The protocol of any transfer is written into the error log of the application. To examine the messages of the transfers within the cache database you may for every single step click on the button in the transfer window in case an error occurred. In the main window the protocol for all transfers is shown in the Protocol part. A click on the button requeries resp. shows the protocol. The option will show the line numbers of the protocol and the option will restrict the output to failures and errors stored in the protocol. By default both options are seleted and the number of lines is restricted to 1000. In case of longer protocols change the number of lines for the output. The button will show the protocol in the default editor of your computer. The button will clear the protocol.