Sometimes you're hired by a company which is a bit rigorous on blocking outgoing communication. A security consultant would probably agree on this practice, but most developers won't. Nowadays a lot of services in the cloud operate on different ports. Azure services don't always operate on port 80 and 443, hosted noSQL providers have connection strings with (seemingly) random ports, etc. It's not always easy to get approval to open ports in the company firewall, especially if you're doing some tests and proof of concept projects.
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