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You need to check for the reference to the membership service request; 
there will be entries caused by launches.  Either check the log at the 
time you make the data sync, or look for an entry for the BasicLTI 
building block which includes "extension" in its path.

Stephen

On 31/08/18 11:54, Tom Salyers wrote:
> Hi, Stephen.
> 
> I'm seeing BasicLTI references in the access log to "webpat", which I 
> can only assume are WebPA-related. (But let me know if I'm wrong.) Also, 
> commenting out the curl_setopt line didn't seem to make a difference.
> 
> --
> Tom Salyers
> VLE Developer
> 
> The University of Sheffield
> Corporate Information & Computing Services (CiCS)
> 10-12 Brunswick Street
> Sheffield, S10 2FN
> Tel:  0114 222 1141
> [log in to unmask] <mailto:[log in to unmask]>
> 
> On Fri, Aug 31, 2018 at 11:47 AM, Stephen P Vickers 
> <[log in to unmask] 
> <mailto:[log in to unmask]>> wrote:
> 
>     In addition, try removing or commenting out this line from
>     lib/LTI_Tool_Provider.php:
> 
>            curl_setopt($ch, CURLOPT_SSLVERSION,3);
> 
>     Stephen
> 
>     On 31/08/18 11:33, Tom Salyers wrote:
> 
>         Hi, all.
> 
>         We've got a test installation of the new version of WebPA going
>         and we're attempting to integrate it with Blackboard using the
>         latest LTI connector version. The actual integration seems to be
>         working fine...up until the point where we try to sync data,
>         when we get an "Unable to access memberships list from source,
>         please try again later" error message.
> 
>         I'm not sure where the actual error is coming in, but it looks
>         like the problem is coming up in the LTI connector. From the web
>         server error log:
> 
>         [Fri Aug 31 11:06:19.841037 2018] [:error] [pid 1176] [client
>         143.167.16.2:50423 <http://143.167.16.2:50423>
>         <http://143.167.16.2:50423>] PHP Warning: 
>         DOMDocument::loadXML(): Empty string supplied as input in
>         /var/www/data/webpa211/mod/lti/lib/LTI_Tool_Provider.php on line
>         2185, referer: https://webpad.shef.ac.uk/mod/lti/admin/manage/
>         <https://webpad.shef.ac.uk/mod/lti/admin/manage/>
>         <https://webpad.shef.ac.uk/mod/lti/admin/manage/
>         <https://webpad.shef.ac.uk/mod/lti/admin/manage/>>
>         [Fri Aug 31 11:06:19.841230 2018] [:error] [pid 1176] [client
>         143.167.16.2:50423 <http://143.167.16.2:50423>
>         <http://143.167.16.2:50423>] PHP Notice:  Trying to get property
>         of non-object in
>         /var/www/data/webpa211/mod/lti/lib/LTI_Tool_Provider.php on line
>         2282, referer: https://webpad.shef.ac.uk/mod/lti/admin/manage/
>         <https://webpad.shef.ac.uk/mod/lti/admin/manage/>
>         <https://webpad.shef.ac.uk/mod/lti/admin/manage/
>         <https://webpad.shef.ac.uk/mod/lti/admin/manage/>>
> 
>         Stephen Vickers asked if I had any firewall issues, but it
>         doesn't seem to be the case--Blackboard and WebPA seem to be
>         communicating just fine otherwise.
> 
>         --
>         Tom Salyers
>         VLE Developer
> 
>         The University of Sheffield
>         Corporate Information & Computing Services (CiCS)
>         10-12 Brunswick Street
>         Sheffield, S10 2FN
>         Tel:  0114 222 1141
>         [log in to unmask] <mailto:[log in to unmask]>
>         <mailto:[log in to unmask]
>         <mailto:[log in to unmask]>>
> 
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