Don't have Telegram yet? Try it now!
https://nishantrana.me/2012/07/03/unhandled-exception-system-servicemodel-security-securitynegotiationexception-soap-security-negotiation-with-http-xrmservices2011organization-svc-for-target-http-xrmservices20/
Unhandled Exception: System.ServiceModel.Security.SecurityNegotiationException: SOAP security negotiation with 'http://../XRMServices/2011/Organization.svc' for target 'http://.. /XRMServices/2011/Organization.svc' failed while using Plugin Registration Tool