You can add a gateway.
You must take into account the following information:
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If there is a gateway connecting the Command Center to the CommServe computer, provide the fully qualified domain name of the gateway (for example, gateway.gatewayservices.com) - 
The host name of the proxy computer must be resolvable from outside of the perimeter network and inside the local network. 
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Verify that port 8403 is open for connections from outside of the perimeter network and inside the local network. 
 
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Procedure
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From the navigation pane, go to Manage > Servers. The Servers page appears. 
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In the upper-right, click Add gateway. The Add gateway dialog box appears. 
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In Host name, enter the fully qualified domain name or the IP address of the server. 
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In Server name, enter a name for the access node. This is the name that identifies the access node in the Commvault software. 
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For OS Type, select the operating system of the server. 
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Click Save.