As @chaddb said if you can’t hit the server host name but can hit the IP it sounds like a DNS issue. I see this when a user’s home router assigns ip’s in the same range as the corporate network. We have changed the ip range on home routers in some situations (for a full time remote worker) and have changed the AppserverURL value in the .sysconfig file to the server ip address in others (for temporary fix).
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