Access through fwd-servers fails but access thru WAN IP works, why?

Developer's Corner General Dev Discussions
1

Hi guys

I have a problem with a box I can’t access through the forward servers. The funny thing is, I can access this box through mios control panel (cp.mios.com) and by using the WAN IP directly, e.g. http://ip:3480/data_request?id=xxx

How can this be? The box is not on my local network, un-NAT’ed and therefore accessible on the IP address.

The mios username is 1119 and the serial is 15588

Kind regards

/Mikkel

2

Also, I’ve noticed that I sometimes get an HTTP 500 error from the forward servers. Is that when I access them too frequently, or what is causing this?

3

When you are connecting to the box through cp.mios.com you’re actually using one of the fwd servers. How are you trying to connect through the fwd servers?

4

When the boxes are connectible directly, I am not using the fwd-server. However if the device DOES NOT have a direct connection to the internet, you are correct, but here this is not the case.

When trying through the fwd-servers, I’m trying both of

https://fwd1.mios.com/USER/PASS/SERIAL/data_request?id=lu_status
https://fwd2.mios.com/USER/PASS/SERIAL/data_request?id=lu_status for instance

… and both return no reply most of the times, for a lot of my boxes

EDIT:

Using Firebug, I have captured two sessions, where I log into cp.mios.com and click the “Dashboard” link, to get the UI4. When I try a box that has a direct connection I am communicating through the box’s WAN address, and no connection to fwdX.mios.com is made.

When I try to connect to a box that is NAT’d and thus has no direct connection, I can see that all communication goes through the relevant fwd-server. If you want, I can show you the logs…

5

Can I please get a comment on the above?

Also, why do I get so many of these errors when I try to access my devices through the forward servers?

<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
  <title>500 - Internal Server Error</title>
 </head>
 <body>
  <h1>500 - Internal Server Error</h1>
 </body>
</html>

It seems like this error occurs more frequently if I access the servers rapidly - e.g. 10 requests within a minute or so. Is this error really some sort of “spam protection”, to tell me to throttle down? It’s pretty difficult to guess how this stuff works, so I would really appreciate some feedback on this :slight_smile: