If diagnostics cannot be started, one possible reason is that communication to a device fails due to network proxy settings.
When using proxy, localhost should be excluded if proxy is not used for e.g. firewall. The whitelist in Blancco Mobile Diagnostics and Erasure network settings defines where proxy should not be used. If http/https proxy is defined in Blancco Mobile Diagnostics and Erasure network settings, the whitelist should be defined as: