Here is some information on the subject. If you can't figure it out or don't get a faster response here try talking to your IT Department at work or contact
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Error Message
The "504 Gateway Timeout" error message can be customized by each website. While this isn't very common, keep in mind that this error may present itself in more ways than the common ones listed below:
* "504: Gateway Timeout"
* "HTTP Error 504 - Gateway Timeout"
The 504 Gateway Timeout error displays inside the Internet browser window, just as web pages do.
Cause
The 504 Gateway Timeout error is an HTTP status code that means that one server did not receive a timely response from another server that it was accessing while attempting to load the web page or fill another request by the browser. This usually means that the other server is down or not working properly.
Resolution
The 504 Gateway Timeout error is usually a network error between servers on the Internet or an issue with an actual server, meaning the problem is not with your PC or Internet connection.
Even though the issue is not yours to troubleshoot or resolve, there are a few things you can do:
1. Retry the web page by clicking the refresh/reload button or trying the URL from the address bar again. Even though the 504 Gateway Timeout error is reporting an error outside of your control, the error may only be temporary. Trying the page again will often be successful.
2. Come back later. Since the 504 Gateway Timeout error message is an issue with the web site's network or a server that it communicates with, everyone visiting this site is probably experiencing the same problem as you. Chances are an issue like that has already been brought to the attention of an administrator at the web site and someone is working to resolve it.