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Webmasters Read This Before Disabling SSLv3 for cPanel/WHM

By on 21/09/2015

Following the announcement of the SSL Poodle vulnerability most webmasters have been hard at work securing their servers. Alas while doing some of these updates myself I had discovered that while it is possible to disable SSLv3 for cPanel services on ports 2083, 2087, 2096 – this breaks connections to cPanel from all current versions of Firefox, on any operating system, because Firefox does not support TLS connections to ports other than 443.

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It is a serious bug with Firefox, which will be resolved permanently in the November update. For now however you need to decide what to do. If you’re the only one on your server it probably wouldn’t kill you to use Google Chrome for a month until the Firefox update.

Otherwise if there’s more than just you on the server accessing cPanel and you disable SSLv3 for cPanel, your clients will not be able to connect to it with Firefox causing quiet the frustration. That means WHM, cPanel, Webmail – are all down for everyone using Firefox. Then you’ll be going through a pile of support tickets asking everyone to switch browsers for a little bit.