Just got notification about changing to invalid. This is OK with me (
was reporting this) as I think now this only happens at this specific
provider with his setup. Changed to another provider -> could not
reproduce this.

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https://bugs.launchpad.net/bugs/1527565

Title:
  SSO from moodle locks server 503 php_slow warnings

Status in Mahara:
  Invalid

Bug description:
  When doing many (15 pupils) simultaneous switches/logins from moodle
  to Mahara (Mahoodle installation, 3.0+ and 15.10.1) server locks until
  producing a 503 error and logging into php_slow.log:

  [16-Dec-2015 08:42:29]  [pool e48616] pid 13050
  script_filename = /data/web/e48616/html/mahara/htdocs/auth/xmlrpc/land.php
  [0x00007f1abf912228] curl_exec() 
/data/web/e48616/html/mahara-15.10.1/htdocs/lib/web.php:4224
  [0x00007f1abf911f98] mahara_http_request() 
/data/web/e48616/html/mahara-15.10.1/htdocs/api/xmlrpc/client.php:55
  [0x00007f1abf911b98] send() 
/data/web/e48616/html/mahara-15.10.1/htdocs/auth/xmlrpc/lib.php:103
  [0x00007f1abf9119d0] request_user_authorise() 
/data/web/e48616/html/mahara-15.10.1/htdocs/auth/xmlrpc/land.php:78

  These messages are repeated for many processes and make the two pages
  (Mahara/Moodle) unavailable for minutes. Most of the time a Apache 503
  error ist produced:

  83.218.163.159 - - [16/Dec/2015:08:44:06 +0000] mahara.klocker-mark.at
  "GET
  
/auth/xmlrpc/land.php?token=8f469573ff0d075659fe0184f07348dd4722a5e7&idp=http://moodle
  .klocker-mark.at&wantsurl= HTTP/1.1" 503 0 "-" "Mozilla/5.0 (Windows
  NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)
  Chrome/47.0.2526.80 Safari/537.36"

  The system is practically unusable with multiple pupils at the same
  time.

  I don't know exactly the server versions as I am on a remote server.

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