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cdn1.4dots.com is one of our hosts where we offload static content (e.g. images, javascript and CSS) to improve page loading performance. It doesn't do anything else.
Note that we made this transition in July 2010 and haven't changed it since. I am surprised it's now that you encountered problems with your firewall.
The reason why we're using 4dots.com and not mobileread.com is because this way requests to static files are cookie-less (yet another improvement in performance). Could you tell me the manufacturer of your firewall and/or the service who provides the filter rules?
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