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Could it be the time on the load balancer server that is off ? Could you check the system time on your servers and see that they are all in sync ? Hittesh From: WebPA [mailto:[log in to unmask]] On Behalf Of FINDLAY Mark Sent: Tuesday, October 4, 2016 5:45 PM To: [log in to unmask] Subject: Re: lti connection broken by DNS change Thanks Stephen, Debug gives: Debug error: OAuth signature check failed - perhaps an incorrect secret or timestamp. We haven't yet moved the application onto the new server, simply pointed the dns to the new load balancer in preparation for the change. The load balancer is pointing to the original server. It may also be that the dns change hasn't properly taken effect, I've asked then to undo that. Thanks, Mark. On 04/10/2016 17:34, Stephen P Vickers wrote: In what sense is it broken? Are the launch requests generating an error? If so, what error do you get (check the Learn log files or send a custom launch parameter of debug=true to have it displayed)? Have you checked the system clock on the new server? Stephen On 04/10/16 17:14, FINDLAY Mark wrote: Hello community, We are in the middle of moving our WebPA instance onto new infrastructure. Once we switched the DNS to the new load balancer, it essentially broke the LTI connection to Learn. Has anyone experienced such an issue before, and have any tips on how to restore the connection, without having to create a new one? Thanks in advance, Mark. -- ----------------------- Mark Findlay Service Manager Digital Learning Applications & Media University of Edinburgh Tel: (0131 6) 51 6543