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.

Hi,

Today I was getting the above error while trying to update one of my plugin assemblies. The password of the admin account had recently changed. So I had to Remove the existing connection and create a new one to get things working.

Bye.