It it always best to use protection. An SSL Certificate from SSL.com will ease the minds of anyone who uses the application, expecially outside customers. However, strictly speaking, you could generate a self-signed Certificate Authority that you can make trusted on your internal network and that supplies protection for your network users. This option is not viable if you have users from outside the system, or employees that use their own hardware, since the use of a self-signed certificate will cause a warning message to be displayed.
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