If Z-Cron is started as a system service, it is by default running with the (invisible) user account “LocalSystem“. This account has reduced rights, for example no access rights to network resources. Therefore you might run into issues with access rights during execution. You can change this by running Z-Cron service with administrative rights. Depending on your network environment, either the local administrator account or the domain administrator account has to be put into the form, or at least a user with suitable rights!