Error while loading start page may be caused not only by firewall, but also by PHP scripts

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Currently if the start page fails loading you will see a message like: "Error 
while loading start page. An internal local server was blocked by your 
firewall...". This might not be true, for example when php app throws a 500 
error. Maybe it is possible to differentiate whether this was an error caused 
by firewall, or for example error 500 (or other) caused by PHP application. It 
would need to be checked what http status code is returned when firewall blocks 
application. For all other status codes we could display a different message to 
avoid confusion, for example "Error while loading the start page. Application 
throwed an unknown error (500 status code).".

Original issue reported on code.google.com by czarek.t...@gmail.com on 29 Apr 2014 at 4:23