I have a separate domain name for static content such as images, js files, and css files. I load this static content on the main site from this other domain to double the amount of concurrent connections the browser makes to load the page faster. This seems to work and I haven’t had any issues myself, but I’ve been getting e-mails from users (with screenshots) where none of the static content will load for random periods of about 30 minutes to an hour or so. It only happens for a select few, not everyone on the site.
The other domain is hosted on the same server as the main domain. Restarting the browser and clearing the cache does nothing, it just goes away and starts working again after a while. I can’t think of anything that would cause this, any ideas?
It turned out to be an issue with the DNS setup. If you are having a similar issue, I suggest checking out http://tools.pingdom.com.