Hi Assist2,
I'm sorry you are still having an issue with the mirror server, we thought that the bug is already fixed with the release of AV 18.6.
Firstly, please, could you check that the station is really available via. "ping" and "tracert" to the mirror server?
Secondly, please, could you enable the debug logging, restart the "Avast Business Console Client" service and send us the log files after the content of smbupd.def is newly overwritten?
Thank you in advance