I have been using Retrospect Backup for many years (latest v17.0.2 for a month or so), with Retrospect Backup currently running on a Dell Laptop (Win10 x64) connected to a Desktop (Win10 x64 Pro) running Retrospect Client.

In 2017, client detection problems surfaced ("Error -530 backup client not found", Retrospect 7.7.341 & Win7), and the simplest workround since has been to temporarily disable the antivirus software (VIPRE AS & Malwarebytes) during backups.

Retrospect Tech Support felt that the VIPRE firewall was at fault, but I couldn't find any VIPRE firewall settings that would allow the PCs to communicate using Retrospect Backup.

However, Retrospect Backup is now unable to detect backup clients: "Error -530 backup client not found". I have uninstalled/reinstalled Retrospect Backup, but it will still not detect the Desktop running Retrospect Client (Retrospect Backup 'Live Network': Piton Name Service using multicast ... and permanently 'searching for clients').

Any suggestions to enable the Laptop/Desktop to detect each other - using Retrospect Backup - would therefore be welcome.

- - - Updated - - -

Uninstalling/Reinstalling the (Desktop) Retrospect Client seems to have solved the problem.