\\<server>\c$\<install path>\Zerto\Zerto Virtual Replication\Gui\tweaks.json the line: “t_idleLogOffTimeoutSeconds”: 1800, In our org we changed the value to 10800 (3hrs) and restarted the “Zerto Virtual Manager” service and after 45 min the GUI had not timed out. Or at least it appears this way.