Some time it happen that your vCloud Networking & Security Manager (vShield Manager) stop behaving & you want to restart it. One of the scenarios where you might need this if it stop synchronizing properly with vCenter or vCloud Director. The good news is most of these problems were resolved with the latest release of vCloud Network & Security Manager, but if it happen and you need to restart your vCNS services then below the commands that you can execute at the vCloud Network & Security Manager Console without the need to reboot the vCNS Appliance which can take a while. Below is how to do so in a step by step fashion:

1- Login to your vCNS Console (Default user name & password are as follow u:admin & password: default, if you want to change them you can follow my earlier post: Changing vCNS Console Password

2- Change to enable mode using the following command:

manager> enable

3- Change to Configure Terminal mode using the following command:
manager# configure terminal

4- Stop the web-manager service using the following command:
manager(config)# no web-manager

5- Execute the following command to restart the web-manager service
manager(config)# web-manager

I usually recommend stopping the web-manager service before shutting down vCloud Network & Security Manager if required for maintenance or so on. You can use the above steps up to step 4 to just stop the service & prepare the appliance for shutting down. Hope this help!