[kvanaraj]

In my application some times this type of error occur. 
This error from network or the application side. how to find out?

[php_rocs]

@kvanaraj,

We need more information. Where did you see this error? on the screen? Did you check the log files? Is this the full error message? This might be a database connection error. When does this error happen in the application?

[kvanaraj]

@kvanaraj,

We need more information.  Where did you see this error? on the screen?  Did you check the log files?  Is this the full error message?  This might be a database connection error.  When does this error happen in the application?

I attached the error page while loading. some times it shows. cannot find the error.

[dave friend]

I attached the error page while loading. some times it shows. cannot find the error.

That error could be any one of the following

• The web server isn't running
  
• The web server doesn't understand the URL - for a lot of different reasons
  
• The network issue e.g. it's down or misconfigured, or a firewall is blocking the site,