Ensure that you avoid reserved port numbers when deploying your application. Some application servers will fail to prevent you from deploying your application on a reserved server port (e.g. 1, 7, 9, 11, 13, 15, 17, 19, 20, 21, 22, 23, 25, 37, 42, 43, 53, 77, 79, 87, 95, 101, 102, 103, 104, 109, 110, 111, 113, 115, 117, 119, 123, 135, 139, 143, 179, 389, 465, 512, 513, 514, 515, 526, 530, 531, 532, 540, 556, 563, 587, 601, 636, 993, 995, 2049, 3659, 4045, 6000, 6665, 6666, 6667, 6668, 6669). If you use one of these reserved ports, some web browsers may honor it but at least WebKit-based browsers (e.g. Safari and Google Chrome) will not. You may see some page content but all resources (images and styles) will fail to load.

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