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OK, so it is not a firewall issue.  What is the HTTP response code and 
size of the response for these requests?

Stephen

On 31/08/18 12:11, Tom Salyers wrote:
> There are BasicLTI POST requests with "extension" in the path that line 
> up with the sync attempts I've done.
> 
> --
> 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 12:04 PM, Stephen P Vickers 
> <[log in to unmask] 
> <mailto:[log in to unmask]>> wrote:
> 
>     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]>
>         <mailto:[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]>
>         <mailto:[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>
>                  <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/>>
>                  <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>
>                  <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/>>
>                  <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]>>
>                  <mailto:[log in to unmask]
>         <mailto:[log in to unmask]>
>                  <mailto:[log in to unmask]
>         <mailto:[log in to unmask]>>>
> 
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