Your management interface sessions times out after 60 minutes of idle time.

On a Windows host, this setting is specified by the variable vmware_SESSION_LENGTH, stored in C:\Program Files\VMware\VMware Management Interface\htdocs\init.pl. You can change this setting to any number of minutes, or you can block access to the management interface for all users by setting vmware_SESSION_LENGTH to 0 minutes. You can have persistent sessions that never time out by setting vmware_SESSION_LENGTH to -1.

On a Linux host, you can change this setting by running the management interface configuration program vmware-config-mui.pl. You can block access to the management interface for all users by setting the timeout length to 0 minutes. You can have persistent sessions that never time out by setting the timeout length to -1.