Remote client db / appserver connection

I have a point-of-sale application (GUI for .NET) that I install for my customers via GoToAssist. All of my multi-user installs (database, application server, client networking licenses) have been configured to run on private lans. My connection string to the “server” from each client is: AppService ShopAS -DirectConnect -S 18683 -H <posServer> -sessionModel Session-free. Everything works great. My most recent customer has a shop where I set up his database and Appserver along with the application code.

The ubroker.properties entry for ShopAS is:

[UBroker.AS.ShopAS]

    appserviceNameList=ShopAS

    autoStart=1

    brkrDebuggerKeyAlias=default_server

    brkrLogAppend=0

    brokerLogFile=C:\GSS\Shop\server\log\gsBroker.log

    controllingNameServer=NS1

    environment=ShopAS

    keyAlias=default_server

    mqBrokerLogFile=@{WorkPath}\ShopAS.mqbroker.log

    mqServerLogFile=@{WorkPath}\ShopAS.mqserver.log

    operatingMode=State-free

    portNumber=18683

    PROPATH=.,.\shared,.\server

    registerNameServer=1

    srvrLogAppend=0

    srvrLogFile=c:\gss\Shop\server\log\gsServer.log

    srvrStartupParam=-pf c:\gss\Shop\server\pf\pos-as.pf

    srvrStartupProc=services\startserver.p

    srvrStartupProcParam=-T c:\GSS\Shop\wrk -rereadnolock

    uuid=2158bfd799119933:-216f99cd:14861ef27da:-7e41

    workDir=c:\GSS\Shop\bin

My customer insists on a remote client connection. The “server” is in Nevada and the “client”, which I haven’t set up yet, is in Callifornia. All the data that I send from/to my database is in ProDataSets. I’ve never dealt with remote clients. Do I set up a VPN. Does the “server” need a static IP address that I add it to my connection string?  I really appreciate any help you can give.