When accessing business-central via Mod_jk load balancer, an exception occurs during Resteasy HttpServletDispatcher service() method and the login process is not completed. The exception is raised in the Resteasy code when the request's content-type header is processed, because this header contains the wrong value. This issue only presents when using Firefox 7 and above, and can be avoided by open the configuration panel of FireFox (In the address bar type about:config). Accepting the warning. Searching for network.http.accept-encoding, and changing the default value (gzip, deflate) to *;q=0.1,gzip,deflat.