Strange behavior regarding user session

Hello, I work at www.telelab.ufsc.br , we run Joomdle for almost 10 months now without major problems. Now has a month that we began to notice this error and it became more frequent.
the bug is characterized by a blank page with a URL like this when the user is trying to access the website (Joomla):
" dev.moodle.telelab.ufsc.br/auth/joomdle/..._user=0&wantsurl=%2F "

When it happen it lasts for about 2 minutes. Other aspect of this behavior is that other computers on the same network present the same error during the same time and shows the exactly same URL even if this second computer had never been used by this user.

Analyzing joomla/plugins/user/joomdlehooks/joomdlehooks.php (the file that appears to be the generator of the url @line 140) I verify that the token is from "JFactory::getSession();" but I can not figure out what is the problem or why the sessions are getting messed up

any help? thanks

notes:
Moodle and Joomla are in different servers.
"username" and "token" in the URL are the same on different computers.
I verified that it happend in two different networks(different places).

Joomdle conf:
redirectless SSO: off
conection method: file_get_contents

server:
PHP is: PHP Version 5.3.2-1ubuntu4.19
Apache is: Apache/2.2.14 (Ubuntu)
Joomla is: Joomla! 2.5.7 Stable
Joomdle is: Joomdle 0.82
Moodle is: 2.2.3+ (Build: 20120624)
Community Builder is: 1.8.1

Really strange behaviour indeed. I have never seen reports of similar problems.

Usually blank pages are caused by server errors, so you could check logs to see if you find something.

> Other aspect of this behavior is that other computers on the same network present the same error during the same time and shows the exactly same URL even if this second computer had never been used by this user.

Have you tried connecting from a different network at the same time?
Maybe it's some problem in your network, proxy....

Thanks for your feedback Antonio.

I could not connect from a different network at the same time but I know it happend in 2 different networks so the odds are that it's not network, proxy related. Unfortunately I don't have access to the logs of this server and it's also a shared server that has shown some problems in the past.

I'll proceed moving the Joomla to the same server as the Moodle, hope it fix the question. Thoughts on that?

As I don't have any idea of why that problem is happening, I don't know if moving serves will have any impact.

a feedback on the issue:

moving the Joomla to the same server and changing the conection method to cURL solved the problem. I can't confirm that making only one of those changes would solve the problem.

also, from the moodle's apache log:



Thanks for the support

Thanks for the update. We will be alert, in case someone reports a similar problem.