You can configure connectivity to the CommServe computer using a network gateway during a remote installation using the CommCell Console.
Before You Begin
You must open some network ports. For more information, see Review Firewall and Network Port Requirements.
Procedure
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On the Network Route Configuration page of the installation wizard, select the There is Firewall between Client machine and CommServe check box, and then click CommServe is reachable only through proxy. 
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From the Proxy client name list, select the client name of the Commvault network gateway. 
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Click Next to continue with the client installation.