Having an IP address based restriction will help to stop unauthorised users from connecting to the application, however it doesn't protect information in transit from the authorised PCs to the server.

Say for example that one of the authorised systems uses a wireless network to access your server.  without SSL it might be possible for an attacker to sniff your password as it goes over the network and use that to get unauthorised access to your server.

So implementing SSL (and ensuring that you have a trusted certificate installed to help stop Man-In-The-Middle attacks) is a good additional security measure.

Is IP restriction enough or should I SSL my web authentication?
When I update my google chrome or chromium to a version that is higher than 38 The window of the browser gets black functional square. It's all black even the top bar. I basically can't see anything just black. When I downgrade to version 38 or previous version, It runs correctly. The machine has centos 6.6 3.10.56-11.el6.centos.alt.x86_64.


